So this is from the manga Kochikame:
Basically the guy on the ground was asking the cop directions while the cop was listening to a horse race on the radio and found out his horse lost.
Anyway, in this sentence what does "スって" mean? The closest I can find is "吸う," like he was absorbed in the race, but is that right?
Next, "頭にきてる" is another phrase I'm unfamiliar with. This link says it means mad, so is this a set phrase or what word is きてる coming from?
Then finally, what does "だてに" mean? The closest I can find is "伊達" which seems weird in this sense. And "ぶらさげてる," in this context it means like his gun isn't hanging from his holster, right?
Lotta questions there, so I appreciate any help I can get, thanks!
For accessibility purposes, I've included a transcription. The angry policeman says the following:
And then the man on the ground says: