Another word for weed.
It gets it's meaning from that weed makes you giggle and the word noodles from ramen noodles for which stoners normally eat after getting stoned.
Dude 1: I'm gonna go get some giggle noodles.
Dude 2 (unknowing): Um.... yea, I could go for some spaghetti also.
Dude 1: Yea, after I eat my giggle noodles.