back blowing 

basicly when you take a drag from a cigarette, then blow the smoke into someones mouth and they inhale.

daym, look at those two hot chicks back blowing.

back blowing by voldemort9999999 September 4, 2010

blowing back 

When your girlfriend gives you a blow job at home so hard that cum shoots out so fast that it starts to blow you girlfriend back 10 feet and covers your house.

we were doing it so hard it started blowing back at her 10 feet

blowing back by rshizzal February 1, 2015

Backblowing 

An oral sex position where a man is on all fours and his penis is pulled to his rear (through his legs) and fellated from behind him.

Sunny was backblowing him while fingering his asshole.

Backblowing by Slangeek February 26, 2010