There's a party in my pants, its going down from 10-3
STS is telling the bitches from the previous line to come sleep with him (thats the party in his pants), and giving them a timetable. This is likely 10pm to 3am.
This could be a reference to two Paul Rudd movies. In the movie “Role Models”, Rudd’s character says “I can’t rock ‘n roll all night. I can rock 'n roll from like 1-3.”
While in the movie “Anchorman”, his character famously convinced Steve Carell’s character to invite an anchorwoman to a “party in his pants”.
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