An erection, throbber, boner, or stiffy capable of tremendous expulsion power at any moment. The contents of said expulsion are difficult to aim.
"Damn man, I wasn't expecting Lady Gaga to turn me on, but when I saw her in a movie preview looking natural and pliant and as energetic as a jackrabbit in heat, my mind started to wander into fantasy. Next thing I knew I was warning my lady friend that I had a tummy musket. Sadly, that warning was too late. R.I.P."
See Tummy Sticks:
Tummy sticks is the situation, commonly referred to as a game, in which two erect men cuddle closely and face-to-face causing their two erect penises, or sticks, to push upwards between their stomachs, or tummy's. Sticks combine with tummy's, hence the name "tummy sticks."
Grant: Take me now, Chris! Take me now!
Chris: Hey Grant, wanna play tummy Drums (sticks)?
Grant: Let's do that! Let's do exactly that!
<game of tummy sticks ensues>
Used when referring to sledding on your stomach.
I went sledding on my tummy muffin.
an upset stomach, feeling sick in the belly
Robin: Oi bro, want another Taco?
Phillip: Nah mate, I have a dicky tummy
The sensation you get when you drink a lot of liquid, the tummy becomes "splashy" and can be sloshed at will.
Man, I just drank so much cold pop I've got splashy tummy
A person who makes and eats mac and cheese before playing tummy sticks with his lover. Sometimes cheese wiz is involved while playing tummy sticks during cheesy stomach.
Cheesy tummy can be dangerous because if you eat too much tummy sticks will not feel normal.