Top Definition
A misguided statement for 'lets be serious', usually said for laughs.
Lettuce be cereal, I know you be 'mirin my aesthetics.
by DaUsualCrew December 28, 2011
1 more definition
A fun way to say : Let us be serious
Person 1: Duur huur
Person 2: Lettuce be cereal

Person 1: Alright, whats up?
by Akiray December 28, 2011

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