boo up

verb

To start a romantic relationship with someone.

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Meanings

verbboo up (third-person singular simple present boos up, present participle booing up, simple past and past participle booed up or boo'd up)

present singular third person boos up · participle present booing up · participle past booed up · past booed up · participle past boo'd up · past boo'd up

  1. USintransitiveslangTo start a romantic relationship with someone.
    1 more example

    Although the No. 1 single “As It Was” set the shimmying, shimmering stage for the album — with its ’80s pogo pop that has you breaking out your best Molly Ringwald moves — the second half of “Harry’s House” settles into dreamy, woozy balladry that will have you booing up. Or getting on Tinder to find one.

    2022 May 20, Chuck Arnold, “Harry Styles takes it to the bedroom on ‘Harry’s House’”, in New York Post

Origin

From boo (“significant other”); compare booed up.

Full word history & related roots →
Cite this entry
APA

boo up. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/boo%20up

MLA

“boo up.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/boo%20up. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “boo up,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/boo%20up.

Source: boo up on Wiktionary, CC BY-SA 4.0.