to say good bye or see you at a later period in the day (when you leave,depart from a place, dwelling or any other area which you frequent with your friends, brothers, sisters, gang, crew, or homies) n.b. can be shortened to mash or used with any other kind of potato e.g. jacket/boiled/baked/roast/sweet potatoes
safe kids, i've got to go, mash potata - see ya lata
to crush ones testicles
"Ouch bollocks!, i just sat down funny and mashed my potatoes"
Mashed potato means to masturbate.
He's mash potatoing in his room!
What the fuck, did you mash potato yourself?