When you're acting aloof online, not responding to emails, initiating IM chats, replying to evites, etc. The opposite of acting e-ffusive.
Guy_98: wtf? you super busy today or what?
Girl_01: no. why? what's with the 'tude?
Guy_98: you haven't replied
to my evite or said hi on gchat. you're acting e-loof.