uptanker Share definition Flag It is the comapnion to the drydocker. To rid a commode of its flushing water, and to then deficate in the tank on the rear of the commode. The janitor hates us after last night. They got both a drydocker and a uptanker. uptanker by Don August 29, 2004 0 0 Get merch Get the uptanker mug. Buy Now — $32.95 See more merch