In this porn video tag, "sissy" refers to a submissive male or effeminate man who is typically dressed in feminine clothing and engages in activities generally associated with women. The term has both sexual and non-sexual connotations, but in the context of this tag, it implies a roleplaying scenario that involves a male participant engaging in typically female-centric sexual acts.
"Huge dildo" is a reference to a large, often phallic-shaped sex toy used for penetration during sexual activities. The term "huge" denotes that the dildo in question is larger than average in size and/or girth, which may be appealing to those who enjoy more intense sensations during play.
Together, this tag suggests a porn video featuring a submissive male character engaging in intimate acts with a large dildo as part of a sissy roleplay scenario. As with all adult content, viewers should ensure they are of legal age and consent to view such material.