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A 'Jeffrey Leg Day' is a session in the gym where you tell the lads you are doing legs, but you do arms instead.
Jeff: Ah lads, I'm aching after doing legs in the gym.

Lads: Piss off mate, I saw you doing curls in the mirror & you have legs like a sparrow, you clearly did as Jeffrey leg day.
by Klick C January 16, 2018
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