Happens mainly when you have just been told off/dissed/burned. This is a failed attempt to put some ice on that burn, or to insult them back. When you make a horrible come back that nobody gets or is just plain weak, making you look like even more of a fool.
Max: "We're out of butter"
Erik: "That's okay we can just use your girlfriends face"
Max: "Yeah... Well... Your socks are slightly dirty"
Erik: "That was stupid"
(Erik walks away)
Micah: "What was that Max?"
Max: "I don't know dude minced regression"