"How's that is a phrase that is used to make an appeal to the umpire of whether the opposition player is out or not.
The English batsman blocked the ball from hitting the wickets by using his leg (Which is against the Leg Before Wicket rule), so the Australians appealed to the umpire "How's that???" to which the umpire would make a decision of "Out" or "Not Out".
A phrase used repeatedly to deflate an infuriated or excited person. More effective the more realistically interested and naive of the answer the user sounds. It is commonly used in cases where guilt or the obvious wish to be ignored.
1: WE'RE ALL GUNNA DIE!
2: How's that?
1: AN ASTEROID!
2: How's that?
1: CRASHING DEATH AND FIRE ANnd terror and clouds and and...
2: Want a piece of cherry pie?
1: You drank all the milk you asshole!
2: How's that?
1: I saw you!
2: How's that?
1: With my eyes!
2: How's that?
1: Fucking optics! Or cornias or...or something...
2: Want some water?
"What do you think of that?" or "How does that make you feel?"
Originated by a few scumbags that shouted the phrase at a couple kissing (they later both agreed it was good). Later tried to be made into an everyday saying by a mutual friend.
"Ugh, I have work tomorrow."
"How's that taste?"
"Bitter. My job is so boring."