A little hitler is a self-important tosspot who thinks he's in charge. Someone who makes up arbitrary and/or self-serving rules and has a tantrum if they aren't obeyed. They tend to have a park-keeper/traffic-warden mentality; rules are Law and rules come first. They can't handle people who threaten their authority.
Wayne's running a tournament..

Wayne: You didn't spell the name right, Jim. You're out.
Baz: That's unfair, Wayne. You know what he meant.
Wayne: You're out too!
Baz: Ya stupid little hitler.
by wordMann May 10, 2006
Little Hitler is a shaving and trimming short of a women's pubic area.This leaves a small short haired patch of hair that looks like a mustache. Although most men prefer women with shaved pussy, the little hitler is a second best.
Check out the Little Hitler on that Babe!!
by Doug Hightower September 3, 2005
the little hitler is when you stick your finger up a womans bum, pull it out then draw a moustache over her upper lip
by slapsticka December 12, 2008
The act of sticking your thumb up a female's sphincter and acquiring feces and promptly wiping on her upper lip.
My husband and i went all the way last night and i let him finally give me little Hitler's
by Blitzed4lyfe20 October 6, 2016
When that twat who is paid £0.50 an hour in Mc Donalds tells you you can't take 2 straws because it is not regulation, and we all know it is only because behind that counter is the most authority he is ever going to have and he is making sure he takes advantage of it, like a little hitler would.
airport worker: you bag is 0.5kg over weight.. that's £7 please.
passenger: but it's only 0.5kg! can I not take a belt out or something?
airport worker: no.. because I am behind the counter until 5 when i will go home to my husband that will make me cook him fishfingers, so i would like to feel important and watch you squirm.
passenger: well SOMEONE has some serious little hitler syndrome!
by CWWWWWW June 26, 2011