The phrase "gay-lollipop" is a combination of two concepts: the first part, "gay," refers to the sexual orientation of the content, specifically involving males having sexual relations with other males. The second part, "lollipop," likely refers to an object often associated with oral sex, as lollipops are candy that can be sucked on and placed in one's mouth.
In this context, a "gay-lollipop" porn video tag would indicate content involving male-on-male oral sex or similar acts where the use of an object like a lollipop is involved or is a prop in the scene. This is for adult audiences and may not be suitable for those who are not familiar with or experienced in porn videos.