slit 
(slĭt)
(slĭt)n.
A long, straight, narrow cut or opening.
tr.v. slit, slit·ting, slits
1. To make a slit or slits in.
2. To cut lengthwise into strips; split.
[Middle English slitte, from slitten, to split, from Old English slītan, to cut up.]
slitter n.
slitty adj.