Brainfart

[Britney]

A spontaneous stupid (Stupid the noun, not stupid the adjective) usually accompanied by loss of train of thought and saying something fantastically stupid without realising it.

[Jessica]

Adj. Used to describe a temporary loss of short-term memory.

[Raeanne Dimick]

n. A massive, horrible release of stupid that is often offensive to the senses and may create a social faux pa in some settings. Brainfarts often result in an intense feeling of embarrassment and shame compounded by an inability to explain what the hell just happened.