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1.
A person that does copious amounts of cocaine.
I used to like hanging out with that guy, but he just turned into a huge blowhead.
by Slowgun July 03, 2012
 
2.
used when referring to the action of receiving/giving a blow job usually used when one wants to make it abundantly obvious that they want a blow job or head. Most often used by women.
"hey why don't you come over here and give me a blowhead...?"

"dude! i got the best blowhead the other day from this manwhore i met at school"
by sal-adfingers90 October 21, 2009