A really sloppy, annoying, and usually slightly overweight sorority girl. She's most likely the black sheep of the group. This girl will be the most drunk, the most forward, and the most not attractive.
I hung out with Jess and her friends last night, but I had to leave because that swampdonkey friend of hers was all over me.
(noun), pertaining to an individual employed for the express purpose of testing the physical properties of freshconcrete. This is a generally derogatory term, used in the construction industry to describe construction special inspectors, and implies a lack of sophistication and experience with such work.
Construction Superintendent: "We've got concrete to pour and the damned slumpmonkey is holding us up."
Experienced concrete inspector to trainee: "Don't talk back to me, you're just a damned slumpmonkey."
Although it is typically used as a noun, ie "she's a swampdonkey" (referring to a particularly nasty female) it can also be used as an exclamation of immunity. If a male and his peers go to a social function, one male from the group is allowed to claim "swampdonkey". This allows said male to take home even the dirtiest of barflies home with him while his mates are not allowed to give him a hard time of any kind. This is typically used when a male is on an extended dry spell.
"Hey dude, remember that nastychick you went home with last night?"
"Hey, shut your suckhole, dude, I called Swampdonkey".