When the sleeves of someones undershirt are embarrassingly exposed--giving a ruffle-esque appearance.
Dan is the resident anti-poon because he is always gleasoning--his undershirts are always two sizes too big.
by aquadude998 April 12, 2011
the act of unintentionally having the sleeves of your undershirt exposed underneath a polo shirt or other outerwear.
I was going to ask Dan to the dance, but I saw him gleasoning in school one day so I asked Josh instead.
by aquadood April 15, 2011
by happycamper61364 October 05, 2013