-verb to uncle
(used with object)
To uncle (uncling) is a slang term used to refer to a gay man's illicit, sexual relations or activities with a young, under-aged boy - especially in relationships that also involve a sense of mentoring/teaching being passed from the "uncle" to the boy. It is meant to sound similar to the verb "to parent" or "parenting".
Raul plans to uncle boys at the YMCA.