Noun: Basically a girl or guy that is "larger" that of your liking. If the subject is thicker than your standards...then they are a thicker.
This word is also unique in the fact that instead of a negative connotation, it can be a positive tag. If you like the fattys that is, roll in that dough...ect.
She was a thicker, so I passed her off to my buddy.
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.