drop around
(for something) to come for a casual visit that includes something such as tea, dinner, a drink, etc. Drop around for a drink sometime. Yes, please drop around.
drop around (sometime)
and drop by (sometime)to come and visit (someone) at some future time. (Similar to drop in (on someone).) Nice to see you, Mary. You and Bob must drop around sometime. Please do drop around when you're out driving.