An MFL rock is a rock that is painted in the colour of a countries flag and can be found around thorpe st andrew school. If you bring your MFL rock to the MFL office it can be exchanged for a pencil or chocolate.

Slang for an erection
(first context)
Curly fries: I've found an Mfl rock

friend: woah dude

(Second context)
Dude 1: wahey he has an MFL rock
group: whahey
by xX_C00l_9uy_69Xx October 15, 2018
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