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1.
Somebody who goes after all the girls younger than him, and gets alot of action with them. The action of LG slaying is getting with alot of LG's
Bro, Ive slayed so many LG's this year.

Ive gotten with like 15 LG's already, Im the LG slayer of the year.
by WEASLEYLGSLAYER April 13, 2011
 
2.
Any girl under 18 who is younger than the male pursuing her.
"Dude, did you see Connor hitting on Shay?"
"She's only 13, he is such an LG Slayer!"
by Anonymoose99 October 19, 2009