A "Lonely Larry" is a person who is not included or is rejected to a group. He/She is usually seen by themselves at parties, games, etc.
This term is derived from a person named Coleman Bauer. He was referred to as a "Lonely Larry" while being seen to be by himself while others were enjoying a great time. The originator is most likely Carson Ciamaichelo, his arch-nemesis.
Isaiah: Hey, Carson look at that kid over there...
Carson: Yeah, what about him?
Isaiah: What a Lonely Larry!
A project started in 1996, this was an undercover operation to train an average human to be able to emulate people perfectly. The children called "Larry" had two parental units, two siblings, a cat, and a dog each. A few years into the program "Larry" was diagnosed with social difficulties, which made it extremely difficult for them to emulate efficiently. Growing up, they were able to emulate voices, personalities, and quirks of other people down to a point. The program was shut down in 2010 after Barack Obama took office and shut down the program. It is rumored that a few "Larry" still exist today.
Something that is super duper highly-larious. Derivative from hilarious. When something is super funny, it can be called high larry. Like that one friend who is really funny when he's high.