A person who resembles a horse. This can be in several ways such as long hair similar to a mane. It can also include making horse like face gestures such as chomping/licking of the lips and mouth. Another way can be stomping and clomping around in an aggressive manner.
Look at that seabiscuit over there for a second I thought she was a horse!
by hb93dlmn November 22, 2009
Top Definition
An ugly member of one's "stable" of hoes. Usually, the sea biscuit can fuck pretty well but isn't very nice to look at.
Person A: Where you goin dawg? Gonna bang yo shawty?

Person B: Nah kid. She's on the rag. I'm off to tag this sea biscuit.
by penumbra July 14, 2006
NOUN. The act of going at it with a girl from behind (doggie style) whilst slapping her on the ass only after kicking her in the leg or arm (your preference) making her a "gimpy horse".
Fucking seabiscuits, dawg...leave your girlfriend's ass as red as her leg...HAHA!
by McSteamy January 07, 2007
the deuce you dropped while swimming in the ocean
man, I just dropped the biggest seabiscuit while I was swimming
by brettmillious September 25, 2005
When you are fucking a chick from behind and you are about to cum you neigh like a horse nice and really loud, so as to cause some sort of confusion so that she looks back at you and then you cum in her face.
Man, you should have seen that bitches face when my seabiscuit blasted her in the face
by markey121 September 30, 2010
the act of releasing stool into a body of water and leaving it there to float
" Dude, it's way too far to the bathroom. i just dropped a sea biscuit right here. You might want to get out of here."
by akripke February 23, 2008
When a group of salor go diveing and find 2 hobnobs then jizz in between them to make a sort of custard cream, is a delecasy among seamen.
Jimmy: Have you got any of those special Sea-biscuits
Bob: Yes fresh this afternoon.
by Azzmation November 03, 2006
A sea-biscuit was when sailors in the early 1700's would find dead rats on the boats they sailed in, came in their chests and boiled them in the soup.
Unbeknownst to Katie she gobbled down a thick sea-biscuit.
by Travass~ November 13, 2006
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