This is the insulting term you call some dude who is acting real tough but you know that he is a total coward. He is soft like a salad and also has no hard crunch that nuts can provide in a salad.
Steve: "Now, shut your mouth before I do! Come at me, bro!"
Greg: "Fuck you, Steve! I ain't afraid of you! Salad no nuts! Yeah, that's what I said - SALAD NO NUTS!"
Steve: "I'm sorry, man. Please be my friend."