A fo-ninja is a fake-ass, wannebe ninja who believes that they are capable of awesome ninja like feats but in reality are idiots who perform dangourous stunts say and talk the way they think real ninjas talk and are always hurting themselves.
jeb is such a fo-ninja he started talking like naruto jumped on a wall then fell off and broke his fatass.
by Kage blast March 30, 2010
by Paraplegic MC October 14, 2003