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1.
it means leave it or allow it in swiss slang talk
aron: phillip delete that shit#
Philip : no!! let it !!!!
by steiger wiger April 26, 2006
 
2.
To allow everything and anything to take it's course.
Example: "Tonight I'm going to go out and LET IT."

Example "I was at the bar and her eyes said she wanted to LET IT."

Example "We worked as hard as we can, now just LET IT."
by Sound Hype January 09, 2014
 
3.
it simply means `forget it, go away...` often used in west london (maidenhead, slough, ascot,...)
if someone pisses u of like- "let it"
by vivaldi69 April 26, 2006