blunder (
http://definr.com/blunder)
n : an embarrassing mistake [syn:
blooper,
bloomer,
bungle,
foul-up,
fuckup,
flub,
botch,
boner,
boo-boo]
v 1: commit a faux pas or fault [syn:
sin,
boob,
goof]
2: make an error [syn:
stumble,
slip up,
trip up]