Noun (plural) - marks left across ones butt cheeks (usually brown) horizontally protruding outward from the anus, caused by prematurely pinching off a full loaf in mid-squeeze. This usually results in "mud-butt" and "sticky cheeks".
Michelle heard Robin screaming about something mindless in the office, and was forced to pinch off a fatloaf, resulting in squinch marks for the duration of the day.
The technical name for the tilde key. You know the key next to the 1 key you never knew the name of.
Player 1: How do I get into console.
Player 2: Press the Mexican Squinch Eye.
Player 1: The what?
Player 2: You know, the key next to the 1 key that no one knows the name.