crazy as a shithouse rat
crazy-ass
jiggy
cray
buggish
cray-cray
loced out
loco
crazypants
bammy
banoodles
gaga
wiggy
bananapants
crazy as a cootie bug
crazy as a cootie
barking mad
off the beam
nutzoid
off one's rocker
gone fishing
off one's onion
loony
insano
deranged
potty
out of one's mind
off the rails
off one's head
stark raving mad
nutsy
demented
hatstand
crackers
off one's chump
nutso
bughouse
cracked as an egg
crazily
becrazed
plumb crazy
meshuggener
not right in the head
not have both oars in the water
loony tunes
insane in the membrane
gobaloon
beyond belief
nerts
freakazoid