when black people (usually athletes or straight hood chimps) get out of control or excited. Start jumping around doing absurd antics such as throwing their arms around, crip walking, stacking, selling drugs, bumpin their gums, and shooting guns.
Those chimps were chimpin in petey pablo's "north carolina" music video.
All the chimps were chimpin at the AND1 mixtape tour.
The happy feeling one has before and after hitting the "tripping" phase while smoking tobacco. Characterized by a very relaxed sensation, without the light-headedness of a tobacco high. Most commonly achieved while using cigars and pipes; cigarettes generally lead straight to "tripping".
"Dude, you trippin yet?"
"Nah, I'm just Chimpin. These smokes suck."
"Woah man. . ."
"Im still chimpin from that cigar."