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when one accidentally says something offensive or stupid
example 1:

amy: "she agrees with me, see you're in shape! finally someone who agrees with me"

norman: "who disagreed?"

example 2:

andrew stone: "your mom is stupid"

david: "your mom is fat"

(person's mom walks in, and heard him put his foot in his mouth)

david: "oh,... uhm hi Mrs. Stone"

example 3:

little kid's mom: "i feel bloated"

little kid named ben: "its okay to be fat when you're old"
(little kids are usually excused from foot in mouth because of their ignorance and innocence)
by eeeeeeoooooop March 15, 2012