Rebless is a term that is likely a combination of "re" and "bless." In the context of adult content, it can be interpreted as a request for a particular sexual act involving oral stimulation. Specifically, the person performing the act (usually referred to as the "bottom") would lick or suck the genitals ("bless") of their partner again or repeatedly. This term is often used in scenarios where the performer enjoys giving oral pleasure and wants to emphasize the repetitive nature of the act.
Note: The exact meaning may vary depending on the context it is used in, as adult content can sometimes have regional or slang meanings that differ from standard English definitions.