I found something that could help you. The dictionary says that 'flat' is "A shallow container in which seedlings are grown and sold". So, I'll explain the FML for you, 'cause it's obvious that you're in need of it. OP is growing some seedlings and she took her boyfriend to see the shallow container with them in it. Apparently, she grows the seedlings and then sells them in order to pay for her fancy shampoo. Did that help? Now, **** your life because even though you have a grasp of what 'flat' is, you're still bitching about the use of that word.

Flat is the British word for apartment. It's not that big of a deal.

The word makes perfect sense, it is just that your ignorance renders you incapable of learning simple words. Instead of writing that entire comment, you could of just searched it up on Google and be done with it. Grow up.