When you screw over your soldiers or employees because you can't get over your own bitterness. Applies to all people who revel in ruining the lives of others because of their own whimsical opinions. Common symptoms of "A Callahan" include Napoleon Complex, little dick syndrome, and others.

lil mad is like big mad but the opposite, you mad but not mad to the extent of pullin somthin

A Callahan is when you finish on a Female while rounding first usually cause by a Bare Penis touch.