From WhatPort80

A challenger appears is a meme derived from Street Fighter 2. When a new character is introduced the phrase would be used. On the internets, if a related but superior character is mentioned people will say a new challenger appears. Challenger is the key word for starting a brawl on 4chan. An challenger don't appears.

Nowadays, however, it is often used unsuccessfully, like most memes.

		YOU'RE DOING IT WRONG!	New Challenger