We used to have names for people in our youth who made a bad impression. Any girl, doomed to never having a second date, who 1) dipped her straw into the guy’s malt or tied a knot in his straw, 2) expected the guy to pay for her meal, or 3) (in later, more affluent times) ordered the most expensive item on the menu, got relegated to the lowest rung of huwomanity. She became a “mensa.”
We’d dismiss these junior high and high school schoolmates with much derision, even though those about whom we’d say, “Es una mensa” more likely wouldn’t have dreamed of a second date with us anyway.
My English/Spanish dictionary defines mensa or menso as someone who’s dull and witless. It’s a coincidence, then, that Mensa (with a capital “M”) is also Latin for “table” and is the name of a prestigious organization of bright people, those whose intelligence is verified through a tough series of tests.