A general pejorative used primarily in online communities, particularly gaming communities.
Etymology: Originally used in Chris Coutt's Tales for the L33T, an adaptation of Shakespeare's classic Romeo and Juliet for a generation more familiar with internet vernacular than Renaissance-era English. The phrase originated from a dialogue between Gregory and Sampson, the former referring to the latter as "Sampfag," a portmanteau of "Sampson" and "fag."
A dirty, sweaty vagina that is potentially also moistened by arousal but not always. Swampvag usually occurs in girls who haven't showered or had sex and didn't clean up afterward. It's most noticeable in rooms with little to no ventilation and on hot days.