From Dictionary.com:
chump,1
n.
A stupid or foolish person; a dolt.
chump,2
tr. & intr.v. chumped, chump·ing, chumps
To chew or make a chewing movement.
chump,3
n : a person who is gullible and easy to take advantage of [syn: fool, gull, mark, patsy, fall guy, sucker, soft touch, mug]
chump,4
name: Mud