Green’s Dictionary of Slang

1. intoxicated from love or romance, often used spec. of having had a lot of sex.

2003		Guardian 15 Nov. 🌐 A still loved-up Ben Affleck and Jennifer Lopez were in town shooting Jersey Girl – the release date of which has headed the same way as the couple’s wedding.
2004		Guardian 12 Feb. 🌐 That’s around one beat for every pound predicted to have been spent by eager Valentines in Britain this year in readiness for an evening of loved-up euphoria.
2012		(con. 1980s) I. Welsh Skagboys 33: He’s no interested in any ay the lassies though —Loved up, n I?
2012		R. Milward Kimberly’s Capital Punishment (2023) 55: There weren’t many loved-up diners.

2. under the influence of MDMA.

2003		Guardian 16 Mar. 🌐 Then at the end of the night, as the ‘loved-up’ feelings begin to fade and be replaced with irritability – usually between 5am and 6am – it was common to take ‘downers’ such as alcohol and heroin.
2007		R. Milward Apples (2023) 159: Perhaps if I was loved-up I could’ve slid up to him and said something nice.