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1.
Someone or something that is lame, uncool, or generally disliked. They are often times from the southern part of the United States, which may or may not have a relation to the plant, "buckwheat". It can be used as a direct insult or used playfully between friends. The noun "buckweed", is not considered a swear or overly inappropriate but is not something good to be called.
"Don't touch that you stupid buckweed!"
"Dave is such a buckweed, I can't beleive he lost my phone."
"Get over here you buckweeed, you have some explaining to do."
by Scott Treeeeeeeeeeeehub February 27, 2008
 
2.
shooting someone in the arse so they do not die instantly, they slowly bleed to death.... out of their arse.
He was found in a Biffa bin... someone gave him Buckweeds
by gammaguy117 February 23, 2011
 
3.
A term used in Northern Ireland to describe a person with little or no common sence. A complete eejit of a human who lacks the most basic hygenic and communication skills that most of us take for granted.
Buckweeds are commonly found speeding through the narrow country roads in white BMW's while sporting a massive joint.
Look, here comes this buckweed Andy, he's lookin a right cunt.
by Clubfoot January 28, 2007
 
4.
(noun)A Term meaning sick,ugly or nasty. Not cool at all. often used by chocolates.
HimDavid says to HeJohn, "did u see mcvans car!its gay as a buckweed!"
by mangina face January 17, 2008
 
5.
Apparently a corruption of "buckwheat," a shrub (Eriogonum fasciculatum and other species) that is a major plant component of sage scrub and chaparral in Southern California. Currently (10-22-07) being used by the media to describe the Agua Dulce fire now raging in the Santa Clarita area north of Los Angeles. Local Los Angeles news media generally betray a total lack of knowledge of the native flora, having in the past described coastal fires in Malibu as "burning hundreds of acres of mesquite" --a plant that does not grow there. I am unable to come up with a place name called "Buckweed" and I am assuming that the so-called "so-called Buckweed Fire" is in fact based on a corruption of buckwheat. I'd be happy to learn otherwise.
"The so-called Buckweed Fire continues to rage out of control."
by Jacques Rifkind October 22, 2007