What's this called?

So I'm fully erected, masturbating, and when i finally am about to blow i sink my hips down and in and nothing comes out...but it feels like it and my penis acts as if it blew a load, steadily throbbin like the stuff is coming out. Did I still "bust a nut?"
 
No, it's like I made myself not go...when I was about to come, I sank my hips down and in like a cornerback position on the football field and sucked in my stomach and nothing came out and my dick was kegeling and throbbing like i did....if this is ballooning, what the heck is?
 
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