Someone who has loadsa money.

Rich, having money, especially when the described person does not usually have money, is poor, etc. This may be a temporary condition, i.e. the money will run out soon. From American hobo slang.

the act of pressing the lever on the side of a toilet to drain it's contents

To beat someone severley or to kill them.

to dunk a basketball

the short form of a flush, or a hand in the game of royal flush.

1. flush down your little sister's goldfish after you realise it's unsuitable for eating.
2. Something women do after putting the tiolet seat down and men before forgetting to put the tiolet seat down.
3. A really gay word defined by my two year old nephew as " letting out the bubbles".