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Sizerp is a mix of a cough syrup that contains codeine and some type of vodka. This combination will cause you to hallucinate.
We were sippin on that sizerp last night.
Sizerp by Dhoffman October 27, 2006
Related Words
When a girl is just a down right whore/slut. She usually loves white guys then goes to blacks next then wherever and whoever next.

Or you could use Sliz which is equally awesome
Josh: "Chelsea is such a Slizernut she was with Tom last night then she was with Jerome tonight and tomorrow its probably gonna be that asian kid on the 4th floor"
Jerry " What dude!! im dating Chelsea"
Josh "Dude your girl is a Sliz"
Slizernut by Ricky Utopia May 28, 2010

Slizered 

to get drunk and high and the same time.
i was halla slizered yesterday.
Slizered by mattmcclune May 17, 2007
Sizerp is cough syrup and vodka mixed togther. YUMMY YUMMY
Robotussin and Skyy Blu, Tylonal and Chrystal, Motrin and Brewsky, etc.
sizerp by pseudonym June 19, 2005

Slizered 

To get wasted out of your fucking mind, getting wasted more than the guys from the hangover
Dude i got so slizered last night, i cant remember a fuckin thing
Slizered by UrbanDictionaryGuy583 September 18, 2010
A big fat gay, typically one who uses IRC.
Slizer by Kueller November 23, 2003