bompin'
A descriptive word, used to comment on the busy-ness or craziness of a situation, usually meaning a lot of people. It can also be used to describe an item, meaning good, or cool. Most generally used as a replacement to the slightly outdated "rockin'". Best when used in conjuction with the word "rat" (assuming that rat=right).
"Man, this place is rat bompin'"
"Whoa, that's one bompin' shirt"
"Whoa, that's one bompin' shirt"