Adjective

(er)

Instantly appealing and memorable (of a tune or phrase).

* {{quote-news

, year=2012 , date=June 3 , author=Nathan Rabin , title=TV: Review: THE SIMPSONS (CLASSIC): “Mr. Plow” (season 4, episode 9; originally aired 11/19/1992) citation , page= , passage=The best of friends become the worst of enemies when Barney makes a hilarious attack ad where he viciously pummels a cardboard cut-out of Homer before special guest star Linda Ronstadt joins the fun to both continue the attack on the helpless Homer stand-in and croon a slanderously accurate, insanely catchy jingle about how “Mr. Plow is a loser/And I think he is a boozer.” }}

Adjective

(en adjective)

Of a disease, easily transmitted to others.

The flu was so contagious that everybody in town got sick!

Of a fashion, laughter, etc., easily passed on to others.

Wearing jeans was a contagious fad at that time.

Of a person, having a disease that can be transmitted to another person by touch.

They were highly contagious , spreading bacteria to other people.