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1.
To say someone (usually female) has bad grades is a euphemism for saying they have large breasts. For instance, a girl with D's (really bad grades) has really big breasts. You can say the worse the grades someone has, the bigger their breasts.
Did you see the new girls in English class, she had really bad grades!

I've never seen someone with such bad grades!

Have you seen Jessica lately? Her grades have been getting worse and worse.
by PamAnders May 03, 2011

Words related to bad grades

college