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1.
RSE
Rock Star Experience. In contrast to a GFE or a PSE, a Rock Star Experience involves being with two girls at once.
The escort invited her friend Christy and offered me an RSE.
by Hellboy13 May 22, 2007
 
2.
a transition, the literal meaning of which is unknown.
Your girlfriend is a total slut, r s e, jerked me off
by BehindEnemaLines April 07, 2008
 
3.
RSE
Stands for Redneck Social Elite.

Refers to cruising urban redneck young people who own and conspicuously wear/drive expensive (but, to the rest of the world, tack) items. When male, the RSE individual generally hangs out in a circle of automobiles in an empty parking lot at night, a scene which necessitates costly automobile accessories and a minimum of two 24K gold necklaces. When female, the RSE individual spends much of her spare change on tanning bed minutes (usually at an establishment that also rents adult videos) and other beauty-related expenses. She is usually dating one or more truck club members. The RSE are rarely seen within either the inner city or truly rural areas.

First known use of RSE: i>k zine, circa 1995
"Whoa, did you check out the neon on the Camaro in the Jefferson Home Furniture parking lot? The RSE are really out tonight!"
by simultaneously April 30, 2006
 
4.
RSe
Racing Strong Engineering
later to become Racing Strong Motorsports. Owners of the MR2OC
I have the RSe shorts shifter in my MR2
by Bill Strong February 04, 2005