said when you have just let of a smelly fart

Fierce Hoor.

Sneaky, especially in business transactions.

settle down

e.g. sit down your goin around the room like a bluebottle fly
not a very nice person "the aul git"

Roughly translated is that will teach you / tough luck

Also see 'That'll Harden Ye' and 'That'll tighten ye'
a way of telling someone to get lost
Go F#@k yourself - "Why don't ye go Fack Yourself!"