When you first insert the tip of your tongue into a vagina and you hear a queff and feel air rush by your face.which smells like old dumpster juice thats been in the hot sun all day....and you decide its a good idea to keep licking.
At my wedding reception i went down on my wifes bridesmaid. Her pussy was such a gagalicious taco i divorced my wife the next day.
Being delicious or fabulous whilst being associated with Homosexuals. A term used by Gay men to describe their feelings on a subject or event.
Also, the name of a Gay Club Night and Bar in Darlington, County Durham, UK - Gaylicious @ Joe's Bar