the hell

Short definition from Wiktionary

Adverb

1. 1
   Used to indicate emphatic rejection of an assertion or request.
2. 2
   Expletive used for emphasis, typically after an interrogative term or relative pronoun.

Interjection

1. 1
   Ellipsis of what the hell, an exclamation indicating surprise or dismay.

Pronoun

1. 1
   Ellipsis of what the hell (“what”).