After Hossler ended with a seven, Poulter made par to seal a win which takes him up to 29th in the World Golf Rankings.
Poulter hasn't always been the most popular player in America and has so often been a thorn in their side during previous Ryder Cup victories.
Poulter had been one over par after 18 Houston holes and prepared to return home before taking to Augusta National in a broadcasting capacity. Hossler's week in Houston shouldn't be remembered by his triple on the lone playoff hole, but rather the fact that he ranked second among the field in SG: Off-the-Tee, fourth in SG: Putting and third in scrambling.
Hossler was only 17 years old when he qualified for his second consecutive US Open in 2012, finishing tied for 29th, and he had held the outright lead midway through the second round.
"I did think I'd made it", Hossler said, "but it hung out there".
"I was patient, I waited my time and this is fantastic".
"He thought he had holed it".
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I did the first sprint and I was starting to breathe immediately. "I don't run with the ball". On another day, Carlos Vela would be lauded for his genius on LAFC's first goal .
Poulter kept his nerve as he putted from 20 feet which prompted a passionate show of emotion as he beat his chest in celebration.
Likely to move into the world's top 30 after a brilliant weekend, he is now in with a massive chance of making another Ryder Cup appearance in France later this year. I gave Ian the ideal read (for him) to make his putt.
Hossler then handed the win to Poulter in the playoff when he thinned his third shot from a greenside bunker into a water hazard.
Poulter and Hossler finished three strokes ahead of American Jordan Spieth whose closing 66 saw him secure third place with Argentine Emiliano Grillo.
His chances of winning looked remote after he shot 73 on Thursday, but rounds of 64, 65 and 67 followed after he flicked what he described as a "mental switch".
Ian Poulter, who said last week after the WGC Dell Match Play that he wasn't sure he was going to play this week, showed up. To come here this week I was exhausted and frustrated.
"I continued that into today and it feels good, so hopefully I can go back out there tomorrow and do exactly the same".