This porn video tag refers to a scene involving a transgender individual engaging in anal stimulation or penetration. The term "tranny" is a slang term for transgender, and "toying ass" refers to the act of using toys or objects for anal play. This tag would be associated with adult content and is meant for an audience familiar with pornography terminology.
In this scenario, the term "tranny-toying-ass" can be understood as a scene where a transgender person is using toys or other objects to stimulate or penetrate their own or a partner's anus, often for sexual pleasure. This can include various types of anal sex toys such as dildos, butt plugs, or vibrators, and may involve different positions or techniques for maximum enjoyment. As with all adult content, viewers should always practice safe sex practices and consent between all participants involved.