term is used when someone is so damn appealing that they are "fuckalious". similar to fuckable, but on such a higher extent, that its not even close. it can also be used as a catchphrase.
dude 1: dude...like daamn, that chick is so fuckalious...i would fucking bang the shit outta her ass through her cunt...
dude 2: dude...thats so nasty, but so fucking hawt, that u just gave me a boner, and i think i came a bit.
When a joke is told and you laugh way harder than you should, because that joke reminds you of something funny your friends have said that is now an inside joke. The joke is hilarious to you, but the literal meaning of the joke is only funny.