this happens in modern warfare 2, when 2 or more nerds join a lobby and use tac inserts and take turns killing eachother till one of them gets a nuke. used most commonly in freeforall. the trick to get rid of it is to go find where they are hiding (easy to tell because tac insert is loud) and rpg the shit out of those cheaters!
nerd1:hey guyz! lets go nuke boosting!
nerd1:21-22-23-24 kills! 1 more!