This phrase stems from ASL, meaning age/sex/location. ASLWEDYWMTKAY stands for age/sex/location what else do you want me to know about you?
It originated from the wonderful omegle.com.
Please explain what it means, otherwise that stranger will (most likely) disconnect…
Stranger 1: ASLWEDYWMTKAY?
Stranger 2: wtf!?!?!
Your conversational partner has disconnected.