An extremity to what ever one is trying to describe.
Skater 1: Bra i just nailed a 10 stair switchfoot impossible!

Skater 2: Dude, that is mega ultron sick!
by DJ Morasky July 1, 2008
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When you cum so hard that your balls retract into your body, along with your legs until you fold into yourself and turn into a car like a transformer.
You: Hey mum, when did you get a new car?
Mum: Oh that’s just your best friend. He had a mega ultron cumshot after fucking me last night.
by Sussy Bussy DaGussy June 1, 2021
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