SLR 

FN SLR - Fabrique Nationale Self Loading Rifle. Standard issue to the british army before the introduction of the SA80.
Also known as the FN FAL in other countries.

MY SLR is playing up again!

SLR by Panhead March 17, 2004

SLR 

Self-Loading Rifle.

"Hear that? Quick pass me my SLR."

SLR by Diego July 28, 2003

SLR 

In an MMO game, for example, Selling Loot Rights.

The following is quoted from mmoquests.com, by Stargrace, with clarifying annotations in {braces.}
--
In EQ2 {Everquest 2} gear becomes bound to you when you do {loot it from a chest, in} an instance. You’re able to trade that loot with anyone who was in the instance for 48 hours after it was looted. What players do is leave the item in the chest, change the loot options to leader only (thus allowing you to assign the loot to someone) auction the gear in a channel, invite the winner to the group, summon them to the dungeon, and pass them the loot.
--
SLR is similar to WTS (Want To Sell)
In the example, an announcement for SLR to an item in the auction channel, pp = Platinum Pieces

MMOplayer tells Auction(1), "SLR Gore-Imbued Chausses starting @ 100pp"

SLR by trannytooner February 9, 2012

SLR 

Stuck-up Lesbian Roleplayer

Typically applied to males who play females in online games and try to hook it up with other females (probably played by another SLR)

That shemale is a real SLR. What a bitch, errr dick... whatever.

SLR by Inaba November 3, 2003

SLR 

A Stuckup Lesbian Roleplayer.
If you are familiar with the term mangina, it is not exactly that. A mangina and an SLR are both males who play female characters in online video games, but an SLR is an extreme version.

SLR's basically pretend to be females, but that they are lesbians. An easy excuse for talking like a guy, or having cyber with other SLR's that they truly believe to be girls. These men are usually 30-40 years old, balding and not going anywhere in life. Period.

Ashent: Lawl did you see those SLR's sitting in the corner emoting at each other?
Soem_guy: The 2 fat guys pretending to be pretty lesbians? Yeah how could you miss 'em?

SLR by Ashent May 18, 2006

SLR 

Sex, Love & Reggae

Earlier this week, Gyptian dropped his EP SLR which stands for “Sex, Love & Reggae”

SLR by ReggaeLuv May 15, 2014

slr 

abbreviation of an awesome band. also see straylight run

fuck this band rocks

slr by brandNEWrawks November 22, 2004