Bunny
In BDSM slang, a bunny is a restrained or displayed submissive person, often in connection with bondage or an arranged role. The term is not strictly defined and can be used differently depending on the scene.
It usually refers to an aesthetic or playful presentation of submission, but it can also simply mean a person who is tied up in a particular situation. It is important to note that such labels can sound diminutive or evaluative, so they should only be used if all involved want them.
In BDSM, the agreed context matters most: if the term is part of a role-play, it may fit; outside that framework, it should be avoided. As with any restraint, the usual safety rules apply.