How would you describe an Orgasm?

Today, my childhood friend came to my place and we were having a discussion I only got married 7 months ago, and we were discussing about sex as most girls do. She asked me a question I couldn’t answer because I didn’t know how to answer?

“What does an Orgasm feel like? And don’t give me non of that romantic novel carp” she said

For a second I froze cos I couldn’t explain it so I want the help of all the ladies out there... how would you describe an Orgasm