What did Jack McCall mean in Deadwood season 1 episode 3?

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. ...

analysis deadwood

Best Answer

OK, I've figured it out. I will just leave this here, in case someone like me will stumble upon this question.

What got me confused in the first place, was misinterpretation of the phrase just desserts.

You see, I have interpreted it literary i.e. "fair sweet food" meaning some bounces or pleasantries, thinking Jack is referring to
Spoiler alert:

Bill beating him at poker big time, earlier that day

While in fact the phrase just desserts is equivalent to just deserts, which in turn means "getting what one deserves, especially a punishment or unfavorable outcome".
With that sorted out it is obvious, as iandotkelly and M. A. Golding said in comments to question, that Jack suggests inflicting physical harm to Bill by ... or otherwise
Spoiler alert: