i got your back
In a bathroom, if someone says 'I got your back' over and over, they're probably trying to sell you crack and are acting weirder than a raccoon on a caffeine rush.
'I got your back', and he was still holding the same arm like it was a cursed arm from a horror movie.
'I got your back', and he was washing his arm so much it looked like a washing machine.
'I got your back', and he was standing there like he was waiting for a sign from God to tell him to stop.