Green’s Dictionary of Slang

grig n.2

[ety. unknown]

(US) anything or anyone that the speaker dislikes or does not require.

OnLine Dict. of Playground Sl. 🌐 grig n. Used to describe an unpleasant, undesirable or unneeded substance, substances, object, objects or subject. ‘What is all this grig on my windshield?’ ‘Where is all this grig coming from?’ ‘Get out! and take your grig with you.’.