It's definition: a phrase used to compare one or more thing(s) to Counterstrike, when there may actually be no relation to Counterstrike at all. Sometimes, there could actually be a relation. This expression could simply be used to annoy people or contribute something (although pointless) to the conversation.
*Counterstrike is a modification of the Half-Life video game.
Bum: Well, I have no money, no family, haven't gotten a GED, can't get a job, and I have cancer. Other than that, I guess I'm doing well.
Bob: *thinks* This is just like Counterstrike.