An unspecified period of time in which a person is forced to go for as long as possible eating only peanut butter sandwiches. Typically found with students and low-paid workers when finances are low.

Also known as 'Pasta Challenge'
'Hey man, wanna' go out and grab a pizza tonight?'

'Can't mate, I'm on the peanut butter challenge...'
by TheBald April 09, 2010

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