Hacker shorthand for lexical analyzer, the input-tokenizing stage in the parser for a language.
“Some C lexers get confused by the old-style compound ops like =-.”
A person who likes to molest people named Dan while they sleep. A "lexer"
Friend: Wow Dan, Lexer really got you good last night
Dan: I know bro I got molested!
Friend: Yeah those Lexer's are pretty gay