The word, "really" is overused. Seriously, it's used way too much in my opinion.
But in all seriousness, forget is just like any other word, it's a word used to make your sentences a bit more intense. For instance, "Who the forget are you?" is a little more serious than, "Who are you?" People who make a big stiff about "cuss" words make me sick, there's no such thing as cuss words.