Top Definition
Shoddy or obviously inaccurate math.
In response to someone using Lego math by saying something like, "I worked for 5 hours and I got 60 bucks! I must have been getting payed like $18 an hour!"

"Dude that is some serious Lego math..."
"What are you using, Lego math?"
by A Fern June 06, 2007
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