LOUD AND PROUD
Steph Curry was so pumped for his bro-in-law's game-winner on Wednesday night ... hewoke up everyone in his house -- and nearly everyone in his neighborhood, too!!
Curry spent part of his off-night from the NBA watching the Suns vs. Mavericks ... and when Damion Lee -- his former Warriors teammate and the husband of his sister, Sydel -- sank an improbable shot to give Phoenix the dub, he absolutely lost his mind.
The 4-time NBA champ and Golden State superstar let out a guttural yell .