A phrase meaning we're all alone. It's meaning derives from the genus homo which only has 1 surviving species left on its branch, homo sapiens. All other species on the genus homo have gone extinct.
NO HOMO IS LITERALLY SAYING “I’m gay but don’t tell anyone”. Usually acts as an escape clause when you want to out yourself but you're not yet ready to say it upfront
My best friend told me that they want tomarry me and my gay ass said "sure, no homo." to not make things awkward between us.