To do something retarded, to not think, to be an overall oblivious person to any situation, and someone that usually has issues paying attention.
Robinson stop horsin or you will actually break your wrist.
by Dr. Rubin December 21, 2010
Get a horsin mug for your Uncle Vivek.
a term for bangin hard, or riding em rough
by Lucas November 14, 2003
Get a horsin mug for your mate Jerry.