A Barnsley 

An unexpected semi.

An unexpected semi errection, like Barnsley's run in the 2008 FA cp reaching the semi final's

Dude, last period I had a Barnsley.

A Barnsley by Chesk September 23, 2009

got a Barnsley 

An expression that means 'unexpected semi erection'. To have a Barnsley. Derived from when Barnsley FC unexpectedly beat Chelsea to go through to the Semi finals. Used for when one is aroused by something one would not have previously expected to be aroused by. Also used to describe an erection that has just come from nowhere.

James: Watching Susan Boyle has given me a Barnsley..

Greg: Get up Joel, we gotta get to class..
Joel: Give it a minute, I got a Barnsley

got a Barnsley by WordWeasal May 25, 2011