Boner Smoke is a made by pants that extremely bunch and bulge in the crotch area beyond normal man bulge and when someone goes to grab the bulge it appears that you have made the boner disappear like a magic trick. Poof! Its gone? Boner Smoke!
She went to grab what she thought appeared as a large boner. Poof! She finds no boner just 2 balls and flaccid penis. POOF! Its gone! BONER SMOKE!