Xessa is the mixture of tobacco,pot and/or hash after being ground or trimmed with scissors.
it's the first step in the process of rolling a joint.
GUY1: "stupid carl sneezed all over the xessa and now i have to vacuum the carpet"
GUY2: "what a dingus, how are we supposed to roll a fucking joint if there's no fucking xessa"
"hey you up for a joint ?"
- "way ahead of you carlos, iv'e already prepared some
-"lets roll that shit"
"this xessa contains both weed and hash, i'm about to do some serious smoking"