This porn video tag can be broken down into the following components:
1. Big boot - Refers to oversized female feet, often seen as a fetish in certain contexts.
2. BBW - Stands for "Big Beautiful Woman," referring to a woman with a larger or fuller body type, which is appreciated and considered attractive in this context.
3. Cartoon - Indicates that the content features an animated or drawn depiction of the sexual act or scene, instead of live-action footage.
So, this tag suggests a porn video featuring a big beautiful woman with oversized feet, depicted in a cartoon format