This phase is always used when an extremely choice, unexpected turn of events occurs. It can be used in a quiet dry humorous manner as well an exclamatory manner.
This phase is meant to impress upon listeners the emotion invoked when a college age frat boy turns and in an amazingly good stroke of luck, is unexpectedly face first in the motorboat position with an attractive pair of breasts.
It is important to be remember that in this situation one must never be over eager lest one appear to be uncool, or let on how excited one really is so as not to frighten or "perv out" the female involved. The phase must be spoken in this same manner or the speaker will sound idiotic.
Note: this is never used in the presence of one's mother. She will slap you.
Ed: "Dude, I was walking down campus and found a $100.00 bill."
Alex: "Tits on your face."
Example 2:
Alex thinks there is no beer left in the house. Alex opens the refrigerator and slides the one bottle of catchup to the left and sees a beer that has been hidden perfectly by the catchup.
Alex: (to himself) "Tits on your face."
Example 3:
Charles: "Nick Swardson is doing stand up tonight!"
Alex: "Tits on your face."
Alex's Mother: SLAP
The word 'flag' as pronounced by people with thick Belfast accents. The term is a perfect encapsulation of the disproportionate and overblown reaction to the removal of the Union Jack (as in 'de fleg') from above City Hall in Belfast. Where previously it had flown for 365 days per year, it is now flown on 17 designated days of the year - in line with many other British cities.
The event caused a portion of the Protestant community ('fleggers') to make international pricks of themselves as they proceeded to wreck the fucking place, claiming it was another erosion of a 'British' identity they perceive to have been under attack since the horrifying spectre of equality reared its head in Northern Ireland.
The word 'fleg' - and indeed 'fleggers' - fittingly describes a section of humanity unconcerned with knowledge, reality or the vagaries of the English language. Like America's tea-baggers they are ruled by instinct, fear and paranoia with a side dish of rampant bigotry and startling ignorance of the world around them.
"Wat de fuck like! The taigs got de fleg took down! Let's wreck de fuckin place! No surrender!"
"De fleg has been took down! Before ye know it there'll be a united Ireland! Attack Short Strand! God Save The Queen!"