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Etymology
Literally "to shit up onto one's back". may be used to refer to making a blunder. This phrase takes that analogy further and describes having such an extremely explosive shit (i.e. a blunder) that the fecal matter ends up on one's back.

Verb

 * 1)  to do absolutely horribly; to fail horribly; to make a terrible and embarrassing mistake

Synonyms

 * ganga hörmulega
 * ganga hörmulega
 * ganga hörmulega