A semenator is extreme good at ejaculating a lot more semen than the average human. Basically, anyone that you know that puts out enough to fill a glass is definitely a semenator. Can also be used in relation to liquids of mass amounts, see examples.
1. My ex-boyfriend was such a semenator.
2. Dude, that guy's sprinkler system puts out so much water, I'm not even sure why he hasn't won the semenator award yet.
3. I wish I was a semenator so I could have kids.
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