"CD" in this context is an abbreviation for "Cumshot," which is a scene in a porn video where the male performer ejaculates on or near the female performer's body, usually her face or breasts. In this case, it might be interpreted as "Cumshot Stroke."
"Stroke" typically refers to the act of masturbation or stimulation of one's genitals, either by oneself or with a partner. It could also suggest a specific style or technique used during masturbation or other sexual activity.
So, this tag would refer to a scene in a porn video where a male performer ejaculates, often following some kind of masturbatory act or stimulation (i.e., "Stroke"), onto or near the body of a female performer.