tip

to give an extra amount of money for a service, such as to a waiter, in appreciation of his efforts. Origins: Years ago, waiters and some others hoping for a little extra money, used to carry around a small box labelled "To Improve Promptness", and soon the initials were shortened to form the single word "tip". Nowadays, it is customary in many places to give a tip which is one tenth of the total bill.

The boy from the lobby took our bags to our room, and from the way he kept standing there in the doorway with his hand slightly out, palm up, you could tell he was hoping for a tip.

nervous

A condition of fear that causes one to be tense, awkward, jittery, and apprehensive, possibly with trembling or excitability, often caused by being uncertain of what dangers may be looming or how to handle them.

For example, teenagers regularly feel nervous when they don't know what an attractive person of the opposite sex thinks of them.

"as nervous as a leaf in a tornado"

"as nervous as a nun in a sperm bank"

Stroking

A frequently-used discreet word for "masturbating". It may be used in reference to a male or female, and it also may be used when it is done by oneself or by someone else.

If you're in polite company, you would use the subtle word "stroking" instead of the blunt terms "masturbating" or "wanking".

Mum: Did you take Charlie his dinner?

Cheryl: No, I couldn't go in. He was busy.

Mum: What do you mean "busy"? If he's busy, you can still take it in, can't you?

Cheryl: No, he needs his privacy. He was, um... busy stroking himself, Mum.

smoking

A really attractive girl is sometimes said to be "smoking" or "smoking hot". It is one of the best compliments you can give a girl, telling her that she is extremely attractive.

I want to introduce you to my sister. Is she hot? Are you kidding? She's smoking!

incest

Incest is when you finally realize that you really do love your brother or your father, and together you discover the wonder and the beauty and the joy of expressing that deep love to each other with your bodies.

"Most girls grow up and leave home and search the world for their true love, never realizing that he was just in the next room - and they would have known, but society had brainwashed them into thinking that incest was somehow taboo."