When you get a boner so fast that it causes a loud bang to emanate from your crotch area.
Jeff: "WHAT THE HELL? WAS THAT A SONIC BOOM?"
Trev: "No Man! Emily just touched my vinky!"
Jeff: "Oh! I thought a jet flew over."
by T-B4G April 03, 2007
When an orgasm is so fast, it makes the air spasm so much that it creates a loud boom.
You know when you see a bird flying up above you and its like crowing or whatever like Crazy? .. Orgasms, fast orgasms. Its just a jet airplane's is so fast that it all sounds in an instant. We call that instant "Sonic Boom." -Kinch-kun
by Janus IIV September 14, 2006

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