Originated by GI's in Japan. Moose is GI slang for the Japanese word Musumei which means girl. Some Japanese girls use it as slang for theri vagina.

Properly spelled Musu

My wife is Japanese this usage goes back 60 years
GI to another "You should see my little moose".
by Otiose January 30, 2008
The act of shitting and then ejaculating on someone or something
Guy 1: "I really feel like trying something freaky tonight."
Guy 2: "I can moose on you if you want."
Guy 1: "Alright man, just don't tell my girlfriend."
Guy 2: "I can moose on her too."
by BootyMasster420 October 13, 2014
When you're having sex with a chick doggie-style and you two are facing the door and you yell real loud: "Moose!" The chick will then pull her head up and have a wide-eyed stupid look on her face. Right at that moment, put your hands behind her head with your fingers pointing upwards to look like antlers as your friend bursts in and takes a picture of her looking like a moose.
Dude, we moosed the hell out of that slut that you railed...
by Pellican January 30, 2009
1)n. A Canadian woodland quadra-ped, has flat antlers but loses them every summer
2)n. someone who is crazy, or just said something or did something crazy
3)adj. discribing someone who resembles def.2
4)v. to play video games, to make cookies (or bake in general), have sex

pl.) moosi (mooss-î)
1)The other night i almost hit a moose.
2)Did you see him dancing? hes such a moose.
3)That was such a moose thing to do.
4)Last night i moosed with your sister. (all may apply)

pl.) Wow those weird kids are a bunch of moosi.
by Moose face...cakes October 05, 2006
A HUGE monster of a baby (usually turned into a handsome man when he grows up, but still kind of dweeby). Verbiage used typically in areas like Simi Valley, CA.
"Brandon was the biggest Moose the hospital had ever seen!"

"Who knew that Moose would have grown up to look like that."
by Penguin <4 November 25, 2013
A very beautiful girl with a bright personality. Shy on the outside, and very conservative. Gorgeous, sexy and outstanding !! Loving and kind. With a personality of gold. She's an amazing lover ;)
Guy: did you see moose today ? Guy #2: Yeah she's FIINEE!!! I'd tap that. Girl: Sorry boys... shes my moose!
by ArtistTrappedWithin November 23, 2011
1. a large, tall or heavy person of either gender: a fat and/or homely woman should be more properly called a 'cow' (conventional slang)
2. any large animal or thing (colloquial)
1. That 6' 5" 375 pound lineman is a real moose!
2. My German Shepherd dog is a MOOSE 150 pounds!!
That Kenworth truck is a moose for size!!
by Jon64Bailey June 21, 2009
verb. Grabbing a woman's breasts. The term is in contrast to grabbing her rear end, which would be 'goosing'. Usually accompanied by a loud shout of "Moose!"
She wasn't paying attention, so I moosed her.
by Sarah Krentz February 06, 2008

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