slang for dragon

Poo or Feces

The art of sitting on the toilet facing the cistern and deficating, thus leaving a dirty, unremovable skid mark in the pan.

Mergen Dergen is used in place of other words that you just can't remember or say at the moment.

a diegen dergen (dee-gen der-gen) is a make up “german word” that is use to call someone a dickhead or a dumbass.