Who asked is a very simple word created by an unknown person that didn't ask. Mostly related to people who didn't ask about your opinion because it's invalid.
Emma UwU: look guys!!! i became dreamsexual!!! im proud of myself!!!
Some random bitch: Damn bro, that's crazy and all but who asked?
who asked is a thing when someone doesnt ana chat to you anymore but you just dont wana admit it they say hi you say who they say you say asked for a good example look at the thing