He's reading a script in his hand inside his apartment, which is a high school jock related play driven by sports, dominance, popularity and chicks called 'The Jock of All Trades'. He's been wearing different jock jerseys, football pants and cleats to commit to the part.

"Listen Trevor, there can only be one jock per date! And after I score that touchdown against the opposing Flaming Falcons — well you can kiss that blondie of yours goodbye 'cause I'm gonna win her over whether you like it or not! Even if that means I have to put my body through the dirt in order to be the best quarterback there is - which is something you oughta think about before you end up yapping your gums off your jaw! And sure, you can go ahead and brag about you being a complete chick magnet, but you should see me when I'm on the field. You know why? Cause I've got game!"

He shows off his 'game face' in the mirror before he briefly stops acting to realize what the facial expression looks like

"Oh wait, that's my constipated face."

He says before practicing his 'game' face some more