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.
Brother 1: Amy really wants to have sex with brothers.
Brother 2: I'm up for it, but only if we wear condoms. I don't want to be a funcle at 25.
Typically men named Jeff and have sexual relations with their childhood best friend. Funcle's love to ski and are oddly attracted to little boys with the last name doyle. It's a big turn on for a "funcle"
My dad is leaving at night to meet my funcle when mommy goes to sleep