Slirt is a insulting term synonymous with shmo, jerk, kneebiter, etc. Originally this word was found carved into a tree and has been researched for the past three years to discover its true meaning, history, and purpose. Example: Why don't you go shut up, slirt.
SLIRT
Meaning of SLIRT in English
Slang English vocab. Английский сленговый словарь. 2012