Dirty 7-11

1) Noun - A particularly nasty blowjob, one that makes you feel like you walked around in 7-11 barefoot.

or

2)Noun - A girl known for giving nasty blowjobs, especially midget girls.

Stay away from her, dude, she's nothing but a Dirty 7-11.

That bitch gave me a Dirty 7-11 last night.