Same here, I feel ill at ease if I am walking on the inside. It’s like standing for a lady or opening the door for her nibs—it’s inbred, I suppose.
Soooo..... I looked up nib for another meaning other than something to do with the end of a pen.
The closest definition I could find which might work was “a small pointed or projecting part “
Are you opening the door for her small, pointed, projecting boobs. :)