the fuck
(slang) {{non-gloss|Used with an interrogative pronoun as an intensifier to express anger, frustration, incredulity, or other strong emotion.}}
(slang) {{non-gloss|Used after verbs forming a part of a phrasal verb as an intensifier to imply aggressive emphasis.}}
(by ellipsis) {{non-gloss|Used as a shortened form of the common interrogative phrases.}}
(slang) {{non-gloss|Used to emphatically express that something isn't true.}}
(AAVE) {{n-g|Used to emphasize an adjective;}} fucking.