Top Definition
Unlike a full "hard on" the penis stays in a half errect state for an extended period of time. You may feel like it wants to become harder more errect, however the penis stayed at the same "half boner" state unlil outside forces are acted upon it.
Dude, everytime that new girl from accounting walks by I get a slow roaster...I just need to fuck her!
de Scholly369 14 Iulie 2009

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