Its a term I heard while growing up in the ghetto (Compton, CA). It refers to the situation that is often common with black women having babies by large quantities and the euphemism implied to the vaginal canal and the slang term for black babies combined.
"That fat negra has a nigglet canal; she can't stop popin' them chilin' and boy does she collect that welfare check."
When two guys each take their dick and put it in each of onegirls ears and then blowing their load causing the semen to meet in the middle or the stronger blast coming out the other
when a chick douches and then lets the douche water flow into another womans vagina
big tits Mcgee-"hey courtney, you still up for that trailer parkian water canal?" courtney cuntbag-"sure tits, what time you get off of work?" big tits Mcgee-"seven" courtney cuntbag-"great! i will go buy a condom so we can do the alaskan pipline after" big tits Mcgee-"oh yea,great idea! hey, do you have some eggs at your house?" courtney cuntbag-"yea, why?" big tits Mcgee-"well, i was thinking, maybe we could do the porchegese breakfeast while were at it? and i could call jimmy and we could maybe do the mind worm?" courtney cuntbag-"sounds like a date!