adj. Crude, lewd, and rude (and probably involving a dude). Or my sister. Sorry, sis!
Real citation: In Bukowski's pages grimy, dark potboiler meets an allegory on authoring: picture here the bastard singular issue of Mickey Spillane and Laurence Sterne, and you get a sense of Bukowski's scheme. In the end our gutter-friendly scribe hands us a "meta-pulp."
(William Anthony Nericcio, http://www-rohan.sdsu.edu/dept/press/ReviewINK/BUKOWSKIpulp.html)
Made-up citation: "'Gutter-friendly' is a good quality in writers, not so much in waiters."