What you put on when it's time to get shit done.
When you've played around for a while (usually on a video game) and done well so far, but have decided to play to your max potential when things get rough. Commonly used by both Halo and CS fans.
Halo: Alright Shee fag, you've had your fun, it's time to put on the try hard pants. (gets in a hornet)
CS: Alright Awp Whore, you've had your kill streak, now it's time to put on the try hard pants. (whips out the Famas on burst)
Refers to a player who tries far too hard in online video games games of little or no significance such as warm up or public servers. When most are screwing around or not even playing, this man furiously clicks away in hopes of proving something when nobody else cares.
As a spinoff, one can also be referred to as a trypanties while exhibiting the traits of a trypants with a dash of emo.
"rofl I just got killed by sir trypants in our spawn again."
The act of putting on trypants , meaning that what you are doing is now "serious business" , these pants are worn when ;playing vid games, impressing a girl, the big game.