HomeGlossary Birding slang Lifer A species you see for the first time in your life. Many birders keep a life list and celebrate each new lifer. Birding slangRelated termsFull glossary LBJ Short for "little brown job": a small brown bird that is hard to identify. Dip To miss a bird you went looking for. Life list A running list of every species a birder has seen. Vagrant A bird found far outside its normal range. Jizz The overall impression of a bird from its shape, size, movement and behaviour. Big Day An attempt to record as many species as possible within one calendar day.