You add one "How you been?" to one happy hour One lonely Saturday night You mix one Crown and Coke, one whiskey sour One flickering neon light You take one old flame, that ain't really done And that same old look, yeah, you know that One plus one equals 2 a.m. Lips on bottles ending up on skin No matter how you do the math, yeah, it always ends One plus one equals 2 a.m. ♪ Yeah, we say just one, but who are we kidding? One ain't ever never enough Yeah, once we get started, girl, we ain't quitting Come on, baby, we know us When we have a couple, it just all adds up Singles turn to doubles, we've all got that some- One plus one equals 2 a.m. Lips on bottles ending up on skin No matter how you do the math, yeah, it always ends One plus one equals 2 a.m. ♪ It's calling, it's missing, it's sweet reminiscing It's touching, it's kissing, it's simple addition It's one plus one equals 2 a.m. Lips on bottles ending up on skin No matter how you do the math, yeah, it always ends One plus one equals 2 a.m. ♪ Yeah, it's one plus one equals 2 a.m.