John Green and Hank Green, the founders of Nerdfighteria, have started this epidimic of 'in your pants' sayings. The true nerd that I am, I experimented with his saying and have found it quite amusing. If you find that you are stuck on the saying 'Thats what she said' then you may want to change it up with 'in your pants.' All you have to do is repeat 'in your pants' with book names or after people say things.
example. "Looking for Alaska... in your pants."
. "Zombies vs. Unicorns... in your pants."
. "The forest of hands and feet... in your pants."
. "The iron king... in your pants."
. "An abundance of katherines... in your pants."