Green’s Dictionary of Slang

to clog up with a sticky or messy substance, to become clogged up.

2001		Guardian Rev. 10 Mar. 4: Adrian [...] discovered life as an ex-celebrity chef wasn’t all cherries, after being gunged on.
2015		L. McInerney Glorious Heresies 10: There was blood under him. It gunged into the grout. It’d need wire wool.