make some room
A slang phrase indicating the need to purge some rump funkies from your bowels and/or empty your bladder. This usually coincides with activities that will refill that newly emptied space.
Person 1: "He man, let's go get some lunch."
Person 2: "Sounds good. Just let me hit the head to make some room."
Person 2: "Sounds good. Just let me hit the head to make some room."