While doing a girl from behind, subtly grab a flashlight and flash it towards the ceiling. Once she's distracted and confused by the light, scream "TO THE BATCAVE", and slam it in her ass.
Similar to get to da choppa in that "the batcave" or the destination is already known by all. An excited phrase Often used along with a superhero like hand gesture. (both hands out in front of you. Or only one. One is acceptable)