This is just a silly game, me and my good friend Banksey used to play on gaia, a lot.
It's very straight forward, silly, fun, and great for a laugh to see what people come out with.
Basically you can say anything as long as it ends in "in my pants"
Example: Party in my pants.
or: I like eating apples in my pants.
It can be however long or short, you want.
I just thought it would be interesting and fun, and something to share.