From Longman Dictionary of Contemporary Englishdesigner drugˈdesigner ˌdrug noun [countable] MDDan illegal drug that has an exciting or relaxing effect, and is taken for pleasure
Examples from the Corpus
designer drug• The idea of the game is to collect counters known as E's, another name for the designer drug Ecstasy.• Rachel, 25, is recovering in Liverpool's Broadgreen Hospital after allegedly being given the designer drug ecstacy at a party.• Detectives believe Rachel's drink was spiked with half a tablet of the designer drug at a private party. 