throw away on
throw away on (someone or something)
To waste, squander, or misuse something because of or for the benefit of someone or something. A noun or pronoun is used either before or after "away." No wonder you don't have any savings—you keep throwing it away on junk you don't need! I can't believe I threw my youth away on such an unfulfilling job. Don't throw your time and effort away on people who don't appreciate your efforts.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
throw something away on someone or something
to waste something on someone or something. I won't throw any more money away on your brother-in-law. I've thrown away too much money on that project.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.