Comes from the question asked by concessionary free bus pass users in the mornings, as the pass does not come into effect until 0930 hrs. "Am I t'w early ?" = twerly
Guy 1- "When you go out you don't take home the first girl you talk to just because she makes you all horny."
Guy 2- "It's not just that she's hot, she gives me the feels. Most girls don't make me feel anything. That girl makes me twirly."
Assuming a cowgirl or reverse cowgirl position, the receiving partner holds onto a ceiling fan or similar rotating device while riding the penetrating partner in constant, rhythmic rotation and penetration at no less than 13 mph.