A fork of Rural Dictionary
A person who is happily surprised and proud of something, and is therefore angling his moustaches over his open mouth, blushing but also winking (perhaps to someone who made a compliment).
Etymology: perhaps a combination of ;-), :"), :-O and something else.
Someone: You're the person of the year according to Time!
You: ;"#O
Which "chews" the mind, i.e. hits it strongly for being particularly surprising, amazing, awesome.
I haven't seen anything particularly mind-chewing lately there.