A blowlunch is a person who vomits. It also can be a perjorative implying the only thing the subject can do is vomit.
That guy is a fucktard, assclown and total blowlunch.
by Le Grande Raoul January 08, 2011
(verb) to vomit, esp. vigorously. Also figurative.
I'm gonna blow lunch if I hear about your job one more time.
by anarcissie April 22, 2008