I'm guessing that would burn the shit out of your nasal membranes. It already burns my tongue when it's on there for more than 2 seconds, I have to grab my water really quick. I'm guessing sublingual tramadol would be horrible, too.
I can only imagine the havoc it wreaks on our stomachs, especially in high doses. Pillthrill, an ex-Tramadol addict, had to plug her doses of 800-1000mg (don't do these dosages), as she would throw it back up every single time after a while.