Rowing the Trench

A sex act performed by two persons, in which a male participant rubs their erect penis back and forth along their partner's intergluteal cleft (ass crack). In the midst of passionately hotdogging, the couple link arms at the elbow, using them as leverage to 'row the trench'.

Man, Steve really chafed my stink star while we were rowing the trench.

It's important to properly lube the glute luge before rowing the trench.