below sea level 

to catch someone "below sea level" is to catch someone staring at someone's ass. when a "big booty hoe" walks around, you can catch many guys below sea level.

Person 1: Holy SHIT that girl thicc
Person 2: Yea man I can't help looking below sea level !

below sea level by primetrack November 28, 2018

Below sea level 

A phrase that is a synonym for keep it on the down low.

So, it turns out that I was the one who shot Bambi's mom, but lets try to keep that below sea level.

Below sea level by Barbedwiredribcage1234 January 16, 2011