1) When someone creeps up on you/stalks you to get a boner.

2) When the boner creeps up for no apparent reason.
1) Fred saw Darcie’s perfect ass sway with each step. He was naked and aroused. Behind the bushes, he saw his boner. He started stroking it for immense pleasure. He let out a deep moan drawing attention to him. Darcie peered around the bush and saw naked Fred. “Boner creep!” she yelled. She kicked him in the balls.

2) Greg was in class and was looking at the algebra question with boredom. His penis started to get hard. He tried to relax it by letting it out of his fly. It kept extending. It rubbed against his desk. He took off his pants and boxers for more air. The head became covered with precum. The orgasm built up as Greg felt pleasure rubbing his cock on his desk. He jizzed all over his pants and boxers, becoming wet. He had to finished the class naked from the waist down.
by Well, shit. December 24, 2017
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