The porn video tag "ftm-edging" refers to a scene involving a transmasculine person (FTM - Female-to-Male) engaging in edging. Edging is a sexual technique where one brings themselves close to orgasm but deliberately delays or avoids reaching it for an extended period of time, often to increase pleasure and heighten anticipation. In this context, the tag signifies that the content features a transmasculine person exploring their own or another's body in a sexually stimulating way while purposefully controlling their arousal to prolong the experience.