Is a uncomfortable period of time of silence, in which two people who are usually in the beginning stages of a potential relationship, discover the horror of complete and utter silence. Usually this period of time is so long, that any hope of a sexual encounter is quickly extinguished.
My date was so hot! but my conversational coma kicked in thus i ended the night like i usually do, crying and masturbating.
by MohammedMudSlaP June 25, 2009
An eye-glazing lethargy induced by an individual that insists on explaining in depth a subject of little or no interest to his audience. More prevalent in mixed groups of engineers, scientists, and non-technical people.
"Laurie felt herself slipping into a conversational coma as a guy named Bob, a geologist she met at the party, insisted on explaining in detail why pyroxene and amphibole minerals were present in metamorphic terranes, whatever all that stuff is."
by tecdelver October 1, 2013