verb. The act of one person hopping onto another person's back so that the "top" person is sitting on the "bottom's" lower back with his/her legs wrapped around the bottom's waist. Usually seen with the bottom sprinting around while the top pecks his/her head backwards and forwards. Flip-flopping the roles of top and bottom can occur, but are very rare.
I just saw Peter and Daniel ostriching down the street pissing everybody off. I always thought Peter was the top, but I guess I was wrong.
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