Hi James. It was used in the following context.Two ladies went too another office we have to get some legal files. i will change the name though. sabrina was complaining how heavy the files were however the other lady states in front of the whole office " I had to carry the files on my own Sabrina is a weed" .Sabrina in this instance is very weak. i imagine its a little derogatory and stating she is a weakling
yeah Britain. your weedy definition makes sense. it wasn't reed because Sabrina said she did carry the files but the lady in question then said"yeah to the office door then you gave them to me for the rest of the way". It made her look even weaker.