When your Uncle is too fun to just be a normal 'Uncle'. This Uncle must be referred to as 'Funcle'

The fun uncle.

Fun uncle-noun

That one uncle that you have that is a little..TOO funky. Funky + Uncle = Funcle.

The funest and mostest fun to be around even/especially when drunk.

When a woman fucks two men that are brothers, gets pregnant, and births the child. Unaware of who the true father is, the two men are both labelled the "funcle." A father uncle.

A cross between a father and uncle. Like when your mom marries her husband's brother or has sex with him.

Usually done between incestual familie's who have no scrupels about who they get it on with or what monstrosities they may produce if they happen to get pregnant by the funcle.