The Beginning of the End - S7-E1
Trivia: Jack mentions that Jonathan was able to come back to 30 Rock because "the grass was not greener on the other side." This was a subtle shot at the show Weeds. The actor playing Jonathan (Maulik Pancholy) was on that show, which was about selling marijuana (grass). When Weeds was canceled, Pancholy came back to resume his role on 30 Rock.
Answer: Maybe s02e14, "Sandwich Day"? Liz is talking to Floyd and asking if the girl who answered his phone has a lower back tattoo with a Chinese character that is suppose to mean "peace", but probably means "I have chlamydia." But nothing about it being a tribal tattoo.
Bishop73