A woman's genitals, especially if she has large labia minora (which are sometimes referred to as flaps or meat curtains). The combination of the slang term "eating pussy" and these meat curtains then results in this phrase "a McFlappy Meal".
A troll on the internet who has deemed himself "Lord Internet". He can often be found on Facebook and Xbox live. Is known for pissing off everyone and taking pride in being an asshole.
Facebook girl: Happy McSlappy won't stop trolling my Justin Bieber Statuses!
Guy: That's because you deserve to be trolled by Lord Internet for liking Justin Bieber lol