Gangsta Grandpa
"Haters" challenge today's younger generation as cyberbullying and digital criticism have become commonplace. This guy has a message for the haters, assertively saying "Wussup" in a manner that suggests he doesn't care about their opinions.
However, the wearer appears too mature to be well-versed in current slang. Moreover, he doesn't seem to be a rapper or an internet celebrity, so the likelihood of him having "haters" seems low.