When two people text eachother through their cellphones, saying dirty things. Similar to online sex, but through texting instead.
"Me and Josh were sextexting for so long last night. It made me so horny."
when your having sex and texting at the same time but your partner doesnt know you're texting because your THAT good at it.
I was sextexting my friend because the guy i was hookin up with was boring me.