is basically a subtle way to tell someone they are hot. unless you actually do like their jeans, that's okay too.

if a guy says it,to a girl it mean "hey your ass looks good"
if a girl say it to a girl it mean "what were you thinking" and if a gril says it to a guy it again mean "nice ass"

a usually offensive slang term used by a totally non-hip German teacher (that is actually Danish) to andother totally non-hip or shall i say cool, science teacher name miss Sloan.
The term is now used as a reversal compliment and can easily offend someone if spoken the right way, which is in a deep, smoky Mrs. koler type of talk.