To snick something means to cut it a little bit, usually with scissors or a knife.
Snicking something can be on purpose or by accident, and it usually makes a small, sharp sound.
Examples:
She snicked the paper with the scissors.
He snicked his finger with the knife.
The cat snicked the curtain with its claws.
I snicked the ribbon by mistake!
The ninja snicked the rope with a sharp blade.
The sound of the scissors snicking was very loud.