It shows a sideway glare, or a shifty look especially when used together with the other one ">_>".
It has many meanings which need context to find out. Some common usage are as follows:
- Sarcasm. For example: *"This IQ test shows that I'm the smartest man in the world" "Oh congrats <_<"*
- Annoyance and scorn. For example: *"Can I borrow your car?" "To crash it again? <_<"*
- Emotions indicated by looking around, such as feeling guilty or uncertain. For example: *"Pineapples belong to pizza! <\_< >\_>"*
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