There are more than 20 songs today that reference “Molly”. Molly is short for ‘Molecule” and it is the drug MDMA which is basically the same as ecstasy. Eminem, Miley Cyrus, Kanye West, Rihanna, and Nicki Minaj are just some of the artists using this reference. The below article includes more.

http://www.huffingtonpost.com/2013/09/05/molly-drug-songs_n_3874047.html