Something or someone that is retarded, immoral, and probably an idiot too. Someone who you just want to punch in the face and beat them up till they are a bloody pulp.
pro-Brexit politicians who continue to believe Brexit is still a good thing for the United Kingdom and will argue against any sort of scrutiny based on facts and reality until pink in the face like an inbred pig.
See the news at 10 last night? There was this fucking Neandergammon prick on the telly making all sorts of wild claims about how its past March 29th and we are still in the EU. Maybe he's one of these tax fiddler cunts and wants out at any cost before the EU come chapping his door about his offshore bank account.
She who is a striking combination of a Neanderthal and a Thesbian (a woman that is so ugly and masculine that she has to resort to lesbianism for sex).
A portmanteau of Neanderthal and thug. Ironic because the 'th' in both words should pronounced more like 'neander-tall' and 'tug' based on the German and Hindi etymologies. Often used to describe White people because only people with 100% Sub-Saharan African origins lack neanderthal DNA.
The tendency for men to resort to their primordial caveman tendencies when they are without women for an extended period of time.
Us guys went camping in the wild last week, and after a couple of days we were doing some serious neandering. Tom caught a 10" trout with his bare hands. Dick killed a squirrel by throwing a stone at it, and Harry started a fire by rubbing 2 sticks together.