Longman Dictionary of Contemporary English
n. (context British English) A soft, sticky mass; goo; gunk. vb. 1 (context often with "up" English) To clog with gunge. 2 (context British English) To cover someone with gunge.
Gunge as it is known in the U.K., or slime as it is known in America and most English-speaking areas of the world, is a thick, gooey, yet runny substance with a consistency somewhere between that of paint and custard. It has been a feature on many children's programmes for many years around the world and has made appearances in game shows as well as other programming. While gunge mostly appears on television, it can also be used as a fundraising tool for charities, youth and religious groups. Gunge tanks have appeared at nightclubs and Fun Days. The British charities Comic Relief and Children in Need, supported by the BBC, have used gunge for fundraising in the past. In America, slime is sometimes associated with Nickelodeon, even having several game shows revolving around it, such as Slime Time Live. In most countries, being gunged is seen as a forfeit with the aim to cause embarrassment. In contrast, being slimed in America can be a good thing as well as a bad thing. Overall the main point of being gunged or slimed is to cause mess.
Usage examples of "gunge".
The same whifflers drift aimlessly about hoping to make a few quid on the side, crooked auctioneers, crooked vannies, crooked antique dealers moaning that the antiques are pure unadulterated gunge.
She hadn't seen the guttering from quite this angle before, and it looked to her now as if as well as the mud and gunge up there might also be a bird's nest.
The gunge that would ooze out of Paddington would block up the drains of these flats for weeks.