1. Slang. a shirt which has had its collar stretched to the degree that it indicates the filth or laziness of its wearer.
I was ready to go out last night but I had to change my undershirt because Tom told me it was a bosetti.
1. a short fat person; a person who is wider than they are tall.
2. Slang. a penis that is wider than it is long.
Did you see that chick Jeff brought home last night? That bitch was a grundy.
Wow that guy is an asshole. Its OK - he's probably just pissed about his grundy.