The -P Convention

Turning a word into a question by appending the syllable ‘P’; from the LISP convention of appending the letter ‘P’ to denote a predicate (a boolean-valued function). The question should expect a yes/no answer, though it needn't. (See T and NIL.)

[Once, when we were at a Chinese restaurant, Bill Gosper wanted to know whether someone would like to share with him a two-person-sized bowl of soup. His inquiry was: “Split-p soup?” — GLS]