While the word wanker is a more
general and term for expressing disdain for somebody, the word LAF describes a person with a tendency to show off or brag in an excessive and embarrassing
way.
LAF can also be used as
alternative assignment of feminine behaviour.
"
well at first i thought this guy delivers, but in the
end he was just another laf."
"don't be such a LAF, come and drink with
the boys"