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1.
Burdock is any of a group of biennial thistles in the genus Arctium, family Asteraceae.

The prickly heads of these plants are noted for easily catching on to fur and clothing, thus providing an excellent mechanism for seed dispersal. Burrs cause local irritation and can possibly cause intestinal hairballs in pets. However, most animals avoid ingesting these plants.
Julian, you're covered in burdocks --I hate those fucking things.
by arentiexclusive January 25, 2009
 
2.
playful term of endearment for one's plump buttocks
"Matt, my body aches from all the walking we did today - will you please rub my burdocks?"
by Sarah Beth Rem Martin November 09, 2007