Here is an excerpt from the Deadwood series season 1 episode 3 transcript:
(Street, Jack McCall is checking out the goods at Sol & Seth's tent.)
Seth: Look at that jackass.
Sol: Help you with anything?
Jack: I tell ya, he's bein' done a favor this exact moment. Or would you care to take a guess. A favor in this tent.
Sol: I'd guess it's you doin' one for yourself, Sir, considering quality goods.
Jack: Favor here's bein' done for Wild Bill fuckin' Hickok.
Seth: What are you talking about?
Jack: 'Cause if I'm out prospectin' in the hills, then he ain't gettin' his just desserts. At the poker table or otherwise. Don't ask me what I mean by the last part.
Seth: What do you mean?
Jack: And I said you'd do better not askin'.
Seth: Get outta here.
Jack: I'll buy this one. What's the price on that?
Seth: You ain't buyin' nothin'. (Jack turns around and sees Charlie)
Jack: I know you. Where I know you from?
Utter: Can't help you with that, partner.
Jack: You follow him around. (Laughs. Seth grabs him and runs him forward, tossing him in the muck) Hey!
Seth: That tent's shut to you. Don't come back there.
Jack: (talking to himself) Fuck you. Any plans I might've had to buy somethin', or prospect.
Can anyone explain to me what Jack was alluding to by
... otherwise ...
... At the poker table or otherwise. ...