Green’s Dictionary of Slang

l.u.g. n.

[abbr. lesbian until graduation]

(orig. US campus) a female student who is not necessarily a lesbian, but who experiments with feminism and lesbian politics and culture; thus var. b.u.g., bisexual until graduation.

[US]N.Y. Times 5 June n.p.: There is even a new term—‘lugs,’ lesbians until graduation [HDAS].
Flagpole Mag. Online 25 Aug. [Internet] ‘Confessions of a L.U.G.’ [...] I wasn’t a L.U.G. in the strictest sense of the word; I never gave up men entirely. Call me a B.U.G. (bisexual until graduation).
newyorkmetro.com [Internet] 13 Feb. Though Anne Heche is the most prominent example, many hasbians (sometimes called LUGS: lesbians until graduation) are by-products of nineties liberal-arts educations.