The act of being in a relationship that you know you shouldn't be in any more where you keep breaking up and getting back together. Usually caused by genuine affection or friendship combined with fantastic sex. An on again/off again romance.
Sara: "What are you doing Friday?"
Rachel: "Justin."
Sara: "You're STILL dating him?"
Rachel: "Yeah, well, no, not really, I don't know, kind of. We've been lightbulbing it for about a year now. Haven't found anyone better and, damn, I love that cock."
Person 1 : have you seen lightbulbgnf on tiktok
Person 2: no
Person 1: well you should follow them on tiktok there super swag and pretty
(Go follow @lightbulbgnf on tiktok)