Petty

When a person belittles another person, typically by throwing shade, or rubbing something in one’s face. That person is then being petty.

-Oh ok this is a really nice house. All five of your kids have their own room... okay, okay, okay. And how much is rent? Only $150 a month? Oh yeah you’re the definition of independent.

-Bruh why is you being petty?

Under his belt

Can also mean how many murders one secretly committed.

He got 3 bodies under his belt.