What do these things mean?

what does it mean to get horny or an orgasm

When a person is 'horny' it means they aroused or turned on sexually.

An orgasm is usually when someone is either masturbating or having sex with someone, they achieve a release of built up sexual tension. A lot of things happen during an orgasm and it's not really defined by one thing. It can be physical, emotional, and sometimes a spiritual experience.

If you have any more questions about stuff like this, I'd ask your parents. There's a lot of misinformation out there on the internet.