What does 我三谁了 mean in 我也不知道，我刷四绝朋友告诉我有人刷喇叭骂我小三，我不知道我怎么就小三了，我三谁了?
This sentence is not grammatically correct, and will not be understood without context. However, with the full context, I think most natives would be able to understand it.
Here it means &quot;to whom I became a mistress?&quot;