The quotation stems from a votive epigram (Greek Anthology 6.299.3-4), by Phanias, describing offerings of country produce to Hermes; cf. further extracts from this epigram at theta 429, iota 552, and sigma 1328.
[1] dru/ppa seems to denote black olives, the over-ripe ones, (cf. also the adjective drupe/ths; delta 1541, LSJ s.v. drupeph/s at web address 1), alike Latin drupa, -ae. For this last see Athenaeus, Deipnosophists 2.56A (2.47 Kaibel), quoting Eupolis; Pliny the Elder, Natural History 15.1.2 and passim. Note that nowadays drupe covers every kind of fleshy fruit with a single pit, like peaches, apricots or cherries.
[2] The Suda reads e)fioulki/s (cf. ps.-Zonaras 571, e)fioulke/s), which is an hapax legomenon. Boissonade's conjecture filouli/s (fi/los + ou)=lis), based on the comparison with Dioscorides 1.139, seems quite plausible and explains the first word a(/t', which is otherwise unsatisfactory. The correct form of the verse would thus be a(/ te filouli/s ktl.