A loud tee is a t-shirt which has big writing on it. The writing has one general purpose - for the public to read. T-shirts with a brand written on them don't count as loud tees.
Loud tees, depending on what they see, can show what type of person the person wearing it is.
For example, if someone has a loud tee saying "I Am A Material Girl", it shows that the person wearing the t-shirt is a material girl!
The most popular loud tees, which are usually worn by males, are humorous. A humorous loud tee can saying something like "I am out of my mind, but feel free to leave a message!" or "If you are reading this then you are a perv."
Loud tees can be funny, dirty, girly, the personality of the person wearing it, or to show just how the person is feeling today.
On a sidewalk, two friends are suffering from boredom and are in need of entertainment. Then a stranger wearing a loud tee passes them...
Bobert: Hahahaha! Did you see what that dude's loud tee said?
John: Yes I saw! "Of course I love you, now get me a beer!"
Bobert: That loud tee made me crack up. It just made my day...