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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
 
1.
adj. Insanely fast; also taken as hella fast, very fast, or awesomely fast.
Damn, when its cold outside my dick shrivels up helluvafast.