When you launch a disgusting batch of dung with so much anal force that the clump sticks to the side of the bowl.
"Goddamn I just shit so hard the clump stuck to the bowl! Now that's ShitStickler if I ever seen one!"
A frozen piece of shit that is used later as a cool refreshment
Oh that’s a yum shitstickle you have there
A general swear/ curse word used by some Brits
"Oh shitstickle I spilt my tea!"
Or
" I left my bag at work.. Shitstickle!"