smo is an acronym for "sarcasm may occur", to state the not always so obvious texty sarcasm out there, used whenever a smiley/emoticon doesn´t quite cut it. :P
1. I know losing your eyebrows is horrible, but at least you're pretty smo
2. person 1: hey can I borrow your car, while mine is at the workshop?
person 2: yes by all means wreck mine too then none of us can drive... smo
3. I just love that I can always depend on you, knowing you got my back when I need it, smo fucker