An idiot, dolt, someone who talks incessantly about things they are completely wrong about.
Wow, that Rachel Maddow is a real slewsie.

or

Wow, that Rush Limbaugh is a real slewsie.
by LeJumbo January 08, 2013
I think I must have done a major slewsie last night, it feels like a Mac truck drove through my ass parts.

or

As long as their are anuses, there will be people slewsing things up there. I slewsed the entire hardback works of Danielle Steele up there last night.
by Jesus-H-Christ January 08, 2013

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