This is supposed to be a devil.
The chatter who uses it means they/he/she is up to no good. Probably pranks or something else ^o_o^ is the face
~> is the horned tail
Neko chan chatter:
darn. I forgot i left the key to Liana's room in the lock
Rufio: o rly?
neko chan chatter:
yup
Rufio: ^o_o^~>
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi