nuts
bats
nut-bar
fruity
kee siao
crazy as a bedbug
siao
distraught
daft
cracky
mad as a box of frogs
three stops short of Dagenham
toppy
unglued
bonkers
batty
funny in the head
out of one's mind
bughouse
nutso
crackers
bananas
hatstand
berko
bugfuck
gobaloon
not right in the head
meshuggener
plumb crazy
nutzoid
gone fishing
deranged
potty
loony
insano
doolally tap
loony tunes
insane in the membrane
mad as a March hare
crazy as a cootie
crazy as a cootie bug
gila
wud
cracked as an egg
one fry short of a Happy Meal
becrazed
nutty
lunatical
demented
not wise