Confused with too much wine statement

All of my colleagues went out for dinner. Few team members are from a different part of the country. Everyone had good time - no profanity, no flirting - very decent and joyful conversation. Next morning while we were in a meeting, one guy was very quite (he sat next to me @ dinner; looked like he enjoyed my company in a good way). When I asked him what the matter was - he sent an email with 'cheeky' emoticon and the following