Verb. A common prank among undergraduate civil engineering students, in which the victim has his or her locker stuffed with 100s of useless nomographs. In addition to implying that the victim is a homo (due to the similar spelling) it implies that the student is useless and outdated, just like nomographs have been since the introduction of computers.
Nomo is short for "non-monogamy" or "non-monogamous." It is a term that is gaining acceptance in the alternative lifestyle community, particularly among those who reject the term "swinger" to describe their sexual practices but do not identify as polyamorists.
The ironic play on the word "normal" in "nomo" also appeals to non-monogamous couples who otherwise live in the mainstream (i.e., are married, have children, etc.).