A fork of Rural Dictionary
extremely enthusiastic, delightful
RiCHARD SIMMONS WAS AS KEEN AS MUSTARD TO LAY OUT A WORK OUT PLAN FOR HIS FAT CLIENTS
To be excited and/or show agreement towards participation in an upcoming event
All over gang member 1: "Halo?"
All over gang members 2+3: "Halo!"
All over gang member 4: "I'm as keen as cheese and mustard to play Halo"
All over gang member 1: "Then let's play"
To be very keen on something; to be particularly interested in, or looking forward to something
I hear the meat pie eating competition is on this weekend, and Trac is going to take part. Mate I am keen as mustard to go watch!