Greatly influenced by hip hop bands Beastie Boys, Public Enemy, and Run D.M.C., and rock band Siniestro Total, they started rapping over hip hop bases created by producer Julián Hernández (musician and singer of Siniestro Total).

Armas pal pueblo (1994) was probably the first album made in Spain with a Spanish version of the Parental advisory: Explicit lyrics label on the cover.

Partly due to their polemical texts, DCD did not get much coverage from mainstream media in their beginnings, with the exception of some programs in Radio 3, a station belonging to the government-run Radiotelevisión Española.

The current members of Def Con Dos are César Strawberry (vocals), Alberto Marín, Samuel Barranco, Sagan, Kiki Tornado (drums), and J. Al Ándalus (programming, producing and guitars).

In January 2017, César Strawberry was sentenced to a year in jail by the Spanish Supreme Court for remarks deemed as pro-terrorism made on Twitter between 2013 and 2014.