Wiktionary
have it going on
vb. To instigate, observe, or allow an event to continue.
Usage examples of "have it going on".
But as it went on all night, with the drums falling in for an effect from time to time, it became both deadly monotonous and strangely excruciating to hear, as if you could not bear either to have it going on for one moment longer, or to have it ever stopped.