When you fuck someone so fast you don't even have time to take your clothes off or put a condom on, so you just put your cock through your fly.
"Hey man you wanna know what I did yesterday?"
"What?"
"I had a Sonic Fucking with a girl I don't even know, it only lasted 1 minute"
by J-BAILS13 April 06, 2010
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To fuck a girl with blue hair with the speed of Sonic the Hedgehog
See that hottie over there? I just blue sonic fucked her
by YourMaster February 11, 2009
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