Stupid kids call jokingly call eachother by their first innitial, followed by "unit". These kids don't seem to seem how stupid they sound, because it is dumb in the first place, and so many people say it.
"Yo M-UnIT! HAHHAHAHAHHAHAHA damn man I'm so funny I called Marc 'M-Unit'! Get it? M-Unit instead of G-Unit! HAhAHAHAHAHAAHAHAHA I'm so funny!"