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1.
1) A women that has had too many children.
2)Typically a person with to many children who is on welfare, and can not afford the amount of children they have.
3) Women with too many children due to religious beliefs.
Wow! That women is a fetus cannon, she has like 12 kids!
by Violenza March 05, 2009
 
2.
crude term used to describe a womans vagina
last night me and crystal got together and i gave her FETUS CANNON a good workout
by KingPin8369 October 09, 2009