Fudder mucker, an amusing change to mother fukker , used in contexts when its socially unacceptable to call a fellow dude a mother fucker.
in the presence of a little sister T steals Dans joint
Dan Say, Wait your turn fudder mucker
Little girl You said mother fukker im telling
Dan:No i didnt , i Said fudder mukker , however you swore and now im telling on you.
at this point the littlee sister should cryu . Highly amusing