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1.
The celebration of Thanksgiving dinner with your friends. This usually occurs on the Wednesday before or the Friday after Thanksgiving Day, since Thanksgiving is usually reserved for family gatherings.
"Hey guys, bring over your family leftovers to my house on the Friday after Thanksgiving to celebrate Friendsgiving!"
by makalive45 November 26, 2009
 
2.
When friends and family members gather around before Thanksgiving. An assortment of food is prepared and stories are shared of why everyone is friends and thankful for each other. The only difference between Friendsgiving and Thanksgiving is someone at the party secretly dips their genitals in the gravy before everyone eats without telling a soul. The big secret is then revealed a couple weeks later via picture or video.
Friendsgiving was great! I ate so much food and everyone was conversing nicely. I will say, the gravy was a little on the salty side. I wonder why that was?
by Larry Templeton November 20, 2013
 
3.
An event you hold with one or more friends, where you share a meal the day before Thanksgiving.
You: Hello friend
Friend: Hello
You: Would you like to join me for Friendsgiving?
Friend: I'd be delighted to! It will be the day prior to Thanksgiving, yes?
You: That's correct!
by JerMead November 27, 2013