Scheiser is a misspelling and mispronunciation of the
german word scheiß or scheiße, which is commonly used improperly in American English. In standard
German scheiße is used the same way Americans use fuck.
Scheisse (the English spelling) is also used as a prefix to describe something that is either unpleasant, disagreeable, or otherwise in some way considered to be
bad or wrong.
Scheiße! Ich habe mich verlaufen!
Fuck! I'm lost!
-or-
Scheiße! Ich bin in die Tur meine
Finger zuknallten!
Fuck, I slammed my
finger in the door!
-or-
Ich finde Rauchen total Scheiss.
I think smoking is utterly
dumb
-or-
Scheiser, Ich vergesse, das ich muss Scheisse sagen!
Scheiser, I forgot I am supposed to say Scheisse!