How can I crush his majorly oversized ego?

I met this guy through my friend and we drank together. We ended up kissing and he kept me and shoved my hand down his pants. I knew that I shouldn't have with him cause he is a player so I left. I hung out with him a couple times since then and he kept rubbing my when he was drunk. I overheard him talking to his guy friends about how great he his and how girls should buy him drinks and they should feel privileged to suck his...yea. He hasn't been getting any so he is frustrated. My friends and his friends might end up going to a party all together and I really want to tease him and do something that will be a blow to his egotistical ***! Any ideas?