Davina is a street name among friends for Weed.
So you can have a full conversation about getting high and picking up in public , in a taxi infront of parents etc without worrying about them knowing you're talking about drugs.
Example " what time you picking up davina? " oh im meeting her at 8ish"
" you should come round to mine tonight and spend some time with me and davina?"....etc
Variations - Paloma , diana and more every session