An acronym meaning "Anti-Anime Person". It is pronounced like ape to make it derogatory. An aap are people who hate anime and anything related to anime, some aaps troll anime forums to start flame wars and some may even attack fans. Aaps can range from someone who likes anime just not anime fans to extremists who believe anime is destroying society.
"A troop of aaps caught me reading a manga at school and started giving me a hard time."
"Some aap spammed my anime forum now its all clogged."