shitgiggler
one who does things for shits and giggles; for the fun of it; for no purpose or reason other than one's own amusement.
Shaving my eyebrows off while I was sleeping was completely unnecessary. You're a real shitgiggler.
shitgiggles
When you're in the can, and you let out a cheek smacking string of farts... while you've got a cliffhanger. Afterwards you giggle like a schoolgirl.
shitgiggles
John: Oooh it's comming out
John's ass: brrt brt brrrt brt
John: ...
John: teeheheheheheh
John: Oooh it's comming out
John's ass: brrt brt brrrt brt
John: ...
John: teeheheheheheh