CS:GO Skin Drop Mechanics
A short explanation on how the skin drops work in CS:GO.
Every player on a VAC secured online server has a chance of getting a free skin drop at the end of the map (when the match is over, the scoreboard is displayed and the server is about to change the map). The skin name and the player that received the skin drop are shown at the right side of the scoreboard. The drops one particular Steam account can receive are limited per week, after hitting the limit you won't be able to get any further drops until the cooldown resets.
This information is purely based on the community's experience. None of this has been officially confirmed by Valve and you should take it as everything in life: doubtful.