needlebanger 

A person who shoots up drugs instead of snorting them. Spoken to me by a strung out druggie, so it must be true.

She didn't snort the heroin like she said she did, she's a needlebanger!

needlebanger by livininacountryghetto March 11, 2015

needlemonger 

A person who is a prize cunt who likes to nag a lot

You are an utter needlemonger.

needlemonger by AnotherPersonYouDontKnow October 1, 2020