(noun) the act of hugging someone closely and creepily. its intent is to display affection but it really just turns out being uncomfortable for anyone watching (or in many cases, for the victim of the "ronan.")
a ronan is usually performed but behind, but many forms have derived from the original ronan (for example: the sidways ronan, the front ronan, the 360 ronan.)
(verb) "to ronan" is to perform the act of a ronan on someone, whether or not it is expected. one step below dry humping.
I feel so violated after the ronan that dude just gave me.
Dude: Can I ronan you?
Girl: Can I go throw up and die?