We found 3 dictionaries that define the word for what:

General (2 matching dictionaries)

1. for what: Merriam-Webster
2. for what: Wiktionary

Slang (1 matching dictionary)

3. for what: Urban Dictionary

Definitions from Wiktionary (For what) ▸ adverb:  Alternative form of what for. [For what purpose.] Phrases: For What It's Worth, for what its worth, Turn Down for What, Nice for What, Be Thankful for What You Got, more... ▸ Words similar to for what ▸ Usage examples for for what ▸ Idioms related to for what ▸ Wikipedia articles (New!) ▸ Words that often appear near for what ▸ Rhymes of for what ▸ Invented words related to for what