A proud soldier is when a man has a massive erection but is wearing pants. He will most likely flaunt it about, around any gorgeous women. Proud Soldiers are less efficient when wearing skinny jeans, and most efficient with gym shorts. If you have a small penis it won't work, but if you have a hard charger you will most likely have to beat women off with a stick.
"Dude do you see that girl over there?"
"Yeah man I just got a proud soldier!"
"Fuck dude! thats gross i can see it!"