My Deaf tutor signs it with a quick and short 'good' from chin out about 6-8" and then the same action using the 25 handshape to/from the chin ('favorite').
How do you sign "That's lucky" or "good luck"?
Lifeprint says you sign "good" spell l-u-c-k.
Signsavvy is showing a video with same video as "favorite"
but for fortunate, the sign they are showing is a combination of "favorite" and then the hand falls down like in the sign "bad".
That's another sign 'good l-u-c-k', but u don't show 'fingerspell'.
Sorry, I posted too quickly.
Preaching context, as "Tonight we will learn what the Bible says about . . . and the occult."