Let Your Wind Blow Free

Must explain my reason for grinning It's not what you might think Got a cramp down in my nether region Maybe too many beans methinks It's easy for people to think I'm just happy Coz I am the majority of the time The look on my face can be very similar This time it emanates from behind Think I just need to let a boomer go One that could shatter tall buildings I hesitate to let the damn thing fly For fear it would loosen people's filling Guess I'll just have to suffer in silence Till I reach a McDonald's restroom If I make it, I hope they build 'em strong Down with my drawers then kaboom! The shattered remains can still be seen They decided to make the site a memorial Seventeen people have lost their eyesight Six swore off Big Macs overall Now I've divulged my reason for grinning It's not that I'm happy, you see The real reason is internal combustion Not allowing my wind to blow free!