Wiktionary
pedobear
n. 1 (context internet slang English) A cartoon bear portrayed as pedophilic, typically featured in darkly humorous image macros. 2 (context internet slang English) A pedophile.
Wikipedia
Pedobear
Pedobear is an Internet meme that became popular through the imageboard 4chan. As the name suggests ("pedo" being short for "pedophile"), it is portrayed as a pedophilic bear. It is a concept used to mock pedophiles or people who have any sexual interest in children or jailbait. The bear image has been likened to bait used to lure children or as a mascot for pedophiles.