Fanis is a guy with huge penis and that’s all

1. knowledgeable in a wide variety of fields, especially language 2. to desire another's wife

When someone signs onto their facebook after at least a day, only to find out they don't have any notifications.

Reference to anal sex, usually by a hooker willing to perform said act.

1. Short for "(it) was", "(it) did", "(it) will" or anything similar, as long as the use of "tis" would make no sense if you replaced it with "It is".
2. Short for "It is". People used to say this in the 1800's but now nobody says it in this sense anymore, unless they are old, somehow socially isolated, or just "different".