To "Pull A Blowhan" means to be a lonely,codependent slutty woman who consistently sleeps around, whether or not she is in a relationship. A Blowhan will also usually end up going home from a bar with a complete stranger whose name she does not know to do blow and hump all night.
Meg: Oh my god, the HOTTEST British guy I have ever seen
in my life just hit on me while I was having dinner at Azure! He is mad gorgeous!
Sam: Cool.Did you have a drink with him and then go back to his place?
Meg:No,dude,I was interested and I am looking for love, but I can't Pull A Blowhan!