2. A very very very very very bad grade, which usually prompts disciplinary actions by parents of young children.
3. the last letter in the slang acronym WTF, which is commonly used often by n00bs, or used occasionally by l33ts to indicate surprise, shock, or rejection towards something.
2. I got an F on my Physics test, looks like father is going to tie me to that tree in the front yard and flog me until i'm sunburn red.
nice friend: wtf?
fatass: fucking hungry!
nice friend: didnt you just eat a four course meal only minutes ago?
fatass: yea but im still fungry. take me to golden corral!
nice friend: if you keep eating this much youre probably gonna fie.
nice friend: FUCKING DIE jackass
other commonly used f words are, fored, firsty, and fired.