AFFIRM, AFFIRMATION
INTERJECTIONS/PHRASES
1883 — ENTY! an exclamation of affirmation or surprise → Amer. dial.
1910 — ABSOFUCKINGLUTELY! an exclamation of affirmation → sl.
1910 — DAMN TOOTIN’! an exclamation of affirmation; absolutely! undoubtedly! → US sl.
1930 — NO CRAP! an exclamation of affirmation → sl.
1934 — YA HEY! → YAH HEY! an exclamation of affirmation, greeting, or as an attention-getter → Amer. dial.
1934 — YA HEY DERE! an exclamation of affirmation, greeting, or as an attention-getter → Amer. dial.
1939 — DAMN-BUT! an exclamation of affirmation → Ireland
1962 — AND THAT’S THE WAY IT IS! an exclamation of humorous affirmation → US sl.
1962 — TEN-FOUR a phrase denoting affirmation → sl., orig. & chiefly US
1967 — RIGHTEOUS an exclamation of affirmation or approval; absolutely!, excellent! → sl., orig. African-American
1968 — AND THAT’S THE TRUTH! an exclamation of humorous affirmation of what you have just said → US sl.
1970 — DAMN SKIPPING! an exclamation of enthusiastic affirmation; absolutely! undoubtedly! → sl., orig. African-American
1970 — DAMN STRAIGHT! an exclamation of enthusiastic affirmation; absolutely! undoubtedly! → sl., orig. African-American
1970 — DEAD SET! an exclamation of affirmation → Aust. sl.
1970 — NAKED! an exclamation of affirmation, often as a direct response to a previous statement → US students’ sl.
1983 — NO TILT! an exclamation of affirmation or surprise; no shit! → US euphemism
1990 — I FEEL YOU a phrase of affirmation, agreement → African-American sl.
2000 — I’M SAYING DOE a phrase of affirmation, agreement → African-American sl.
VERBS
1593 — ASSERTIONATE to affirm; to assert, to make assertion → obs.
1726 — DEPONE to affirm, to testify, to asseverate; to give evidence as a witness → Sc.
1790 — UPHOLD to affirm, to maintain in argument; to warrant, to vouch for → Sc. & Eng. dial.
..L19 — SWEAR UP AND DOWN to affirm something emphatically → sl.
Lexicophilia 