1. A dirty person that lives down by a river or creek, claiming to be clean.
That river rat is so filthy.
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A person that is always on AIM. Checks people's away messages every 45 seconds. Speaks using abbreviations like lol, rotfl, lmao, jk...
That Shana she is always on AIM she is such a frickin aim rat.
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An ugly mullet according to schizophrenic singer Wesley Willis
Get the rats nest off of your head, get that crazy ass mullet off your skull
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To have raw sex with many people you don't know while wearing a costume, that looks like a horse head or rat
I got some std from that wild rat sex
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A mat rat is a slutty high school/college student who loves hanging around wrestlers. They do the scoring and cheering for wrestling tournaments and meets, they also try to get some from every single wrestler on the mat.
"You see that scorekeeper over there?"
"Yea, she banged half of the seniors on the team"
"What a mat rat!"
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1. Someone who hoards a bunch of free snacks for themselves for later. Common at meetings or other similar events where free snacks are served.
2. Also someone who just buys a bunch of snacks as groceries, instead of real food.
Jessica is such a snack rat! Can't she just take one hoho at a time?
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native Little Rock car wash denizens, of questionable moral and physical integrity, who ply their trade for the entertainment of Ranger-tabbed military logistical officers (see also: Hobby Horse)
CPT Ranger picked up a hood rat at the carwash.
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