It's a swear word for poo and in France merd is a bad name because it means shit and lots a people say it to specify something or to look cool.
YOU PEICE OF SHIT!
Man's tryna look cool
SHUT UP YOU STINK OF SHIT
something large most animals insects do. most dogs eat. most humans detest.
all beings enjoy
“i just did the fattest shit ever”
“my dog just ate his shit”
“i love shit”
“i cant with your shit”