What does "lose count" mean?
Native speaker’s answer
Rebecca
In this context, "lose count" means to lose track of the number of something, or to not be able to remember the total. Sia is saying that she will keep drinking shots until she loses count (track) of how many she's had. Ex. I've eaten so many cookies, I've lost count. Ex. He interrupted me while I was counting the coins, so I lost count.