A person who either takes their stuff to the gym more often than they climb, someone who consistently and constantly gives BSbeta, or tries to start a problem 2-3 grades above their level and never progresses
A chuffer is a climber who uses the word 'chuffer' in an ambiguously derogatory way towards other (usually stronger) climbers.
When asked the meaning of this word, the person who used it typically starts to use adjectives that describe him/herself.