What is it ?

Last night my boyfriend performed oral sex on me and I kinda feel something running down my vagina . Anyways I asked him when I’m finishing is there stuff that comes out he replied “yea” and I laughed and said it was nasty and he told me it was not . Has anyone had this happen before (feel something coming out of your vagina while your climaxing & I know it’s not squirting ) and what is it ?