meathead math
a reference to, or a calculation of the weight on a barbell or piece of exercise equipment ; common increments are "plates"
Dude #1: Dude, I squated five plates yesterday. That's over 500 pounds.
Dude #2: No man, you're meathead math is off - its only 495.
Dude #2: No man, you're meathead math is off - its only 495.