A hugely politically incorrect term for someone who's not very good at something.
A contraction of the words spina bifida, which is a disease affecting about 1 in 1,000 children and leads to loss or bladder and bowel control, paralysis, hydrocephalus and a general air of being crap at stuff.
Hence the all-purpose term biff.
Examples of usage:
- "you're such a fcuking biff, you are" (my Drill Instructor back in 1982)
Note the use of a prefix such as "wiki" to suggest Flowers is only a biff when it comes to editing the ARRSEpedia.
The opposite of biff is ninja