The definition of fucking is vulgar slang used to express frustration or disgust.
(adjective)When you are extremely disgusted with the ongoing bad weather, this is an example of when you might say "This fucking weather!"
Fucking is defined as a vulgar slang term for making love or having sexual intercourse.
(verb)Having random sex in the bathroom of a bar with someone you do not love is an example of fucking.
See fucking in Webster's New World College Dictionary
adjective, adverb
See fucking in American Heritage Dictionary 4
adverb & adj.