shoot one's load

/SH UW1 T W AH0 N EH0 S L OW0 D/
verb
  1. 1

    (idiomatic, vulgar) To ejaculate; to cum.

  2. 2

    (idiomatic, vulgar or slang, figurative) To expend one's resources or one's opportunity, especially prematurely; to blow one's chance.