used in this case as the plural of "lol", an acronym meaning "laugh out loud" or "lots of laughs".
a phrase used to describe a catchphrase or concept that spreads quickly from person to person.
someone with an interest or lifestyle, usually an obscure one, having to do with computers, science fiction, video games, etc. For example Star Trek, World of Warcraft, Comic-Con, etc. are typical areas of interest.
someone with an extremely intense interest or fascination in an academic field of study (often an obscure field). Being a nerd is typically associated with intellect, as they often enjoy specialising in complicated fields of study.