Anatomic euphemism

Because most Transformers fiction is aimed at kids, and most Transformers don't have organic squishy bits, the fiction has introduced a lot of anatomic euphemisms for assorted bits of human anatomy, especially the one you sit on. Most are real mechanical or electronic terms, and also presumably real parts of Transformer anatomy.

Actuator

"Blow it out your actuator, three-face."

—Blackarachnia, "Transform and Roll Out!"

Afterburner

"Now, let's kick afterburners!"

—Slingshot, "Aerial Assault"

"Say uncle, or I'll shove your nose in your afterburner!"

—Sideswipe, "City of Steel"

"Kiss your afterburners goodbye, Decepticon slime!!"

—Spike Witwicky, "The Rebirth, Part 3"

Bearings

"This guy's got bearings of chrome steel."

—Rhinox, "Beast Wars (Part 1)"

Boron compressor

"We were brilliant in battle, Megatron. The Dinobots overwhelmed us with sheer brute force!"
"Brilliant, my boron compressor!"

—Starscream and Megatron, "War of the Dinobots"

Command module

"Stick it in your command module, eight-eyes."

—Rattrap, "Power Surge"

Crankcase

"Sorry about yankin' your crankcase."

—Bulkhead, "Total Meltdown"

Diode

"Me Grimlock here again, Optimus Prime, to pull your diodes out of laser fire."

—Grimlock to a wounded Optimus Prime, "Atlantis, Arise!"

"Chumley, you're one royal pain in the diode."

—Optimus Prime, "Prime Target"

"I'll rip you to pieces with my bare claws, tear out your circuits with my teeth, and spit your diodes back at you!"

—Scorponok (hopefully using a different definition of "diodes") to Unicron, "On the Edge of Extinction!"

Exhaust port

"Tell Megatron to blow it out his exhaust port. We're having a demolition derby."

—Drag Strip mouthing off, "Starscream's Brigade"

"Have you got your processor up your exhaust port?"

—Ratchet to Bumblebee, "Nanosec"

Fan Belt

"Optimus! Elita-1! Get your fan belts in gear!"

—Sentinel Prime to Optimus Prime and Elita-1, "Along Came a Spider"

Gearbox

"What's with you two? [Gestures toward pants area.] Is my gearbox hangin' out or somethin'?"

—Rattrap, "Aftermath"

Manifold

"I've got a plan, if all of you have the cast-iron manifolds for it."

—Prowl, "The Ultimate Doom, Part 1"

"I don't like the idea of Megatron getting the antimatter formula. He can't be trusted!"
"Sure can't, manifold-mouth!"

—Starscream and Bluestreak, ""Roll For It"

Reactor linkage

"I repeat, Decepticons—surrender, or face the consequences!"
"Yeah, and we repeat—go stuff it up your reactor linkage!"

—Optimus Prime and Tailwind, "The Resurrection Gambit!"

Skidplate

"Yeah? And you can kiss my skidplate, fearless leader."

—Rattrap, "Beast Wars (Part 1)"

Tailpipe

"Hey, if you took that broomstick out of your tailpipe every once in a while, you might have some fun for a change!"

—Rattrap to Silverbolt, "The Agenda (Part 1)"

"Whoa! What crawled up your tailpipe?"

—Bumblebee to Ratchet, "The Thrill of the Hunt"

Turbocharger

" I'm goin', too. I'm gonna boot some Decepticon right in his turbocharger."

—Cliffjumper to Optimus Prime, "More Than Meets the Eye, Part 1".

Footnotes

From Teletraan I: The Transformers Wiki, a Wikia wiki.