The act of walking after eating laxative-ridden food (or otherwise poor quality food) to the bathroom. Usually accompanied by the pinching of butt-cheeks to prevent poop from falling out. eg. like rolling up the end of a taco to prevent meat from falling out as you eat it.
when a woman is getting analed while taking a brisk walk trough the local state park.
"yo, i meet this girl at the park" says jimmy
"did you walking taco her?!?!" says ronald
"no man, she wasn't that type of girl" says jimmy
"What the fuck!, any girl is the type for the walking taco."says ronald