| 2026-05-20 | "___ boy!" |
| 2025-07-06 | With "boo," it evokes sadness – with "woo," it evokes happiness |
| 2024-06-16 | Word before "boy" or after "boo" |
| 2024-06-09 | See 23-Down |
| 2024-03-28 | "Woo-___!" |
| 2021-02-12 | Follower of boo or woo |
| 2020-11-05 | Playful suffix with "any" |
| 2020-07-15 | Lead-in to boy or follower of yoo |
| 2020-01-09 | Cry at night |
| 2018-12-20 | See 21-Down |
| 2018-11-07 | "Boo-___!" |
| 2018-09-10 | Slangy ending for "any" |
| 2016-05-19 | Boo-___ |
| 2015-07-01 | Sob syllable |
| 2014-01-19 | "Yoo-___" |
| 2013-06-16 | "___ boy!" |
| 2012-11-05 | Yoo-___ (chocolate drink) |
| 2012-03-18 | Yoo follower |
| 2011-11-09 | Bit of crying |
| 2011-06-12 | Boo follower |
| 2009-11-02 | "Yoo-___!" |
| 2009-06-25 | Part of a sob |
| 2009-05-30 | Sob syllable |
| 2009-05-26 | "Yoo-___!" |
| 2008-04-06 | "Yoo-___!" |
| 2008-01-09 | Boo follower |
| 2005-08-07 | Sob syllable |
| 2005-05-06 | Bit of crying |
| 2003-08-19 | ___-ha |
| 2003-08-10 | Sob syllable |
| 2001-10-22 | "Yoo-___!" |
| 2001-08-06 | "Yoo-__!" |
| 2000-11-23 | Sob syllable |
| 2000-09-26 | Boo follower |
| 1996-08-09 | Yoo-___ |