o'leary - A spiteful act of shitting in your enemy's closet on top of

A spiteful act of shitting in your enemy's closet on top of their stuff like it's a personal insult.

My O'Leary cousin did an O'Leary on my brother. He sat in his closet and shat on his clothes.

I did an O'Leary on my enemy. He found a turd on his shirt and started crying.

My O'Leary friend did an O'Leary on the principal. He sat in the closet and left a present for everyone.