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1.
adj. Insanely fast; also taken as hella fast, very fast, or awesomely fast.
Damn, when its cold outside my dick shrivels up helluvafast.
 
2.
To express an activity or accomplishment with great speed.
He came helluvafast on her.
Or; Shermy's TL broke down helluvafast.
by Anonymous September 15, 2003