These names are plays on words to get gullible folks to say "My Cock's Small" or "My Cock's Long." Either one works on a fool.
*Mike Oxmall can also be spelled "Mike Oxsmall for more subtlety.
Chad: Oi mate, I changed my name to Mike Oxmall.
Bradley: Hi, Mike Oxmall.
Chad: You muppet.
Bradley: What?
Chad: Mike Oxmall/Mike Oxlong
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.