Cosplay is a popular hobby of teen-aged girls in Japan, and is also prominent amongst anime fans worldwide. Sometimes, cosplays can be very good; with a well-crafted, well-fitting costume that looks like its original reference. Such cosplays often require hours of hard work, and considerable seing talent.
Other times, cosplays can be horrendous; especially when fat, balding, middle-aged men decide to cosplay as Sailor Moon, or when a costume really doesn't fit the wearer.
"Aww, man! That fat dude dressed up as Sailor V. over there really shouldn't cosplay!"