Have a cheeseburger

Means just chill out , calm down .

Could also be like a I don't care attitude

Example 1:
John: Dude you forgot my shoes !!!?!

Cameron: My bad dude ill bring them tomorrow , have a cheeseburger ...

Example 2 :
John: I won all the science fairs so far !

Cameron: Have a cheeseburger ..

Having a lay-in.

It means, to lay in bed.
Not necessarily sleeping, enjoying peace and quiet alone.
Whilst the husband gets up, sorts out dotty
Changes Flo's nappy.
Makes Louie and Olivia's breakfast.
And makes Heidi a cup of tea in bed.
Whilst he's keeping noise to a minimum watching motd.

Where's Heidi?

She's having a lay-in.
She'll be there until one of the kids screams or the dog jumps up and licks her face.

have a ring

More intense than having a bone for a girl, having a ring is the position of being so infatuated that you would marry a girl if he is given a chance

Dude, my roomate would totally have a ring for this chick at school, like damn, he was on knee.

have a slash

An Australian term which means to pee.

Hold on mate, I'll be back soon, I just need to have a slash

Happy having

Happy having means to have sex with the same gender

Boy: Am goin to do happy having on you
Other boy: Cool

have a kick

The act of gay sex between two extremely homosexual football players.

“Hey cunt, wanna have a kick?”
“Yeah mate!”
*gay sex*

have a piss

Basically telling someone to piss off or to have a wank.

Employer: hey Steve can you get me that report by the end of the day?
Steve: you'll get it when you get it, have a piss.