1. (Mathehmatiks) - When 2 figures have same dimensions.
2. (Peepull) - When someone is consistent with their actions and personality, unique to themselves. Something that your girlfriend isn't.
1. Whoa, these two triangles are the same size. I'd say they're pretty fucking congruent.
2. Dude when the fat cop started yelling at him, bro didn't even flinch and was all cool about it, I'd say he's pretty congruent.