A weak streamer is someone who doesn't have a very vital flow when they urinate, or takes a while to get the job done.
Calling someone a weak streamer is a hit on their manhood and is usually not taken lightly since it is a qualitative observation and not simply an insult. Could be considered fighting words.
"Damn bro, I never took you for a weak streamer, I guess that explains why Eric took your bitch."

"Hey weak stream, hurry up in there we gotta go too!"
by Jelly Jim July 2, 2019
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