chump (n.)
- asshole
- babe
- bean
- boob
- booby
- butt
- champ
- chaw
- chew
- chomp
- cinch
- conk
- crunch
- cull
- dingbat
- dolt
- dome
- dupe
- fathead
- fish
- fool
- galoot
- goof
- greenhorn
- gudgeon
- gull
- head
- headpiece
- innocent
- jerk
- jerk-off
- klutz
- mark
- monkey
- munch
- mutt
- noddle
- noggin
- noodle
- oaf
- patsy
- pigeon
- plaything
- poll
- pushover
- sap
- saphead
- schlemiel
- scrunch
- stooge
- sucker
- toy
- victim