Personally I prefer a good piece of piano wire or a high E guitar string, but I hear you can do this with your gi sleeve.
Somebody once told me that if I were to drape my right arm around someone’s neck as though I was going for a head lock, and brought my left up to the other side of their head/neck as though I were to plant a big fat prison kiss on him, that I could grab the sleeve of my left arm with my right hand, thumb out, and bring my left hand over and across his Adam’s apple (notice it’s not called an Eve’s apple) I can scissor my arms out and strangle the ever living fuck out of someone.
That’s how ya put a bitch in it’s places.