hold on then... considering that the beats and bose are all about sound signature (it even says on the bose website "bose active acoustic EQ fine-tunes your music" or something) and hardly have imaging, spacing, detail, etc., is it possible to take the frequency graphs, copy it, and make my M50 sound just like them?
Yes and no. The decay and impulse responses may still differ, though they will be somewhat closer than before.
A few of the more popular bassy headphones have already been mentioned. Also consider an Ultrasone HFi580/Pro750/Pro900 which aren't muddy per se, but they do offer quite a bit of rumble that you might find pleasing.
You could also try something like the Digizoid amp to boost bass response.