What is Check Your Pants?
1.
What you say when someone rips a big fart, because they might have shit themselves.
"Pfffffffbttt"
"Dude, check your pants!"
See
2.
Phrase used to mock someone, usually an oponent, after they are beaten by an amazing display of skill in a sport, video game, competition, etc.
Refering to the "opponent" being so shocked and/or amazed as to have shit himself/herself
*lacrosse player with the ball jukes right, behind-the-back-split- dodges to the left, leaving his defense man lying on the ground in the wrong direction, and he rips a shot in the corner unopposed.
team yells to the defense: "Check your pants!"
See