Someone who kills people with an ax.
SGT. WILLY McCOY: Leroy, did you ax Jeeves?
LEROY BROWN: Yeah, I aksed him.
S.W.M.: Why did you do that?
L.B.: I wanted to know why my wife would cheat on me, that's why!
S.W.M.: I've heard enough boys. Sounds like we have the ax murderer alright.
L.B.: Whachoo talkin' about Willys?
S.W.M.: Lock him up!