"When shit is too legit to quit, Bro."
The word "bro" when used in a sentence as qouted above, is making fun of a group of people who are in the lower echelon of society. Most likely you and 90 % of nissan tech(aka honda tech, again another reference to stupidity)

The Picture, from the link posted on page one, was stated as " legit, jdm zomg, boner town usa, in a manor as though we gives a fuck" Thus the picture being adorn with items to illustrate the lulz of the for mentioned thread. If you don't get the picture was making fun of OPs comment in the thread, end your life.