When your wiener gets hard due to the rushing of blood into it. Happens usually when you are horny. Or when you first wake up in the morning.

An erect dick happens when sexually excited or at a random time

when your horny and your dick stands up

Slang term for erection. The penis gets filled with blood and gets hard. aka a hard on, chub, and of course boner.

1) When the male genetalia, fills with blood and becomes errect. This can last anywhere from two minutes to two days, depending on performance and any drugs inherent in the host.

2) A person that is excessively lazy, not wanting to ever do anything or take responsibility for actions.

1. Something that occurs when the blood leaves a man's brain and goes to his cock.

2. Something that you hide from your parents when there's a female in the room.

The bane of an adolescent young man's existence. Usually happens during class, normally after eyeing an attractive girl. Extremely embarassing, and when you get one, you'll stick your hand in your pocket to tuck it into your boxers in a futile attempt to avoid discomfort/embarassment. In the worst cases, you'll end up coming in your pants.