janna is a term for fucking your step brother in the ass in missionary.
person 1: omg guess what i did last night
person 2: omg what did you do girl?!
person 1: you know my step brother, y/n?
person 2: omg yes what happend?
person 1: he saw the strap in my drawer and asked me to fuck him
person 2: OMG Y/N DID THAT!! I WOULDNT EXPECT THAT!! what did you do?!
person 1: fucked him on the bed missionary with my strap
person 2: YOU FUCKED HIM IN THE ASS WOTH YOUR STRAP?!!!!!
person 1: yep, pulled a full janna on him he didnt see what was coming.
person 2: did he like it?
person 1: wouldnt you like a janna if someone did it to you?
person 2: your right about that.