Short for "lambe culo,", a term in Spanish that means a brown noser or a sycophant. Often used by kids in school to insult students who suck up to teachers by volunteering and answering questions constantly.
A male person folding his genitalia between the legs so he appears to have female genetalia. Showing this to a private or wider audience is referd to as lambing.
Also refered to a 'pretend-man-cunt' or 'Mangina'
Johnnie was lambing on the dancfloor last night. The people behind him were more amused than the people in front.