Semi-rection 

When a man sees some-one hot and gets a half erection
When your penis grows bigger but it doesnt go upwards like a normal erection and is therefore a half erection giving the name semi-rection

Dude 1: Man that girls hot!
Dude 2: Shes ayt ive only got a Semi-rection

Dave: Man my balls are so small so im going to try to get a Semi-rection to make it look bigger.

Semi-rection by Superjordz September 10, 2007

smirection

An erection caused by the smile of a beautiful woman.

When she laughed at my witty joke I got the biggest smirection.

smirection by toosweetnoname79 October 20, 2011

semirection 

when a pienes is not fully erected but somewhat stiff

my d*** was bigger than a softy but smaller than a boner..... semirection

semirection by gangsta4lifeXD November 22, 2011

Semirection 

When the phallus is in that often uncomfortable state of half-formed erection. Usually softens if the possesser requires it to be hard, and vice versa if he is in an uncomfortable situation for an erection.

Wearing tight jeans, Bob sucks in his stomach in the hopes that his semirection retreats into placcid-hood.

Semirection by whereareyougoingwithmycookie? February 11, 2013