The yagaru (やがる) verb ending is a special kind of verb ending which shows contempt or anger towards whoever is 'doing' the verb. It attaches to the i verb ending or ren'youkei (see What is the 'i' verb ending?) of the verb. For example
nani wo kangaeyagattanda? (何をかんがえやがったんだ)or
"What the hell were you thinking about?"
koboshiyagatta (こぼしやがった)It can also attach to the te form (see How does the te form work?), as in
"He's damn well spilt it."
ore wo dare da to omotte yagaru
"Who the hell do you think I am?" / "Who the hell do you think you're messing with?"
The yagaru verb ending originated from the verb ending agaru.
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