cultural jammer; jammer noun a cultural activist who creatively subverts advertising material US
These artists are “cultural jammers,” exposing the ways in which corporate and political interests use the media as a tool of behavior modification. — NewYorkTimes, p. 1 (Section 2), 23 December 1990
[T]o paint jammers as “vigilante censors” in the media[.] — Naomi Klein, NoLogo, p. 288, 2001