A defensive action which doesn't admit or deny. Usually shouted in response to an accusation that is most likely true.

My grade on my economics midterm.

an insignificant excuse

1. Full of shit
2. A Hata

When a person is tired and fed up of all the bullshit they would recieve from work or people.

1. An obvious lie
2. A game, in which at least 3 players, pref. 4 or more participate. Each player is dealt as close to the same amount of the deck as possible. The players then take turns laying one or more cards of the same rank down. The rank increases as the play goes around. For example, 4 players are playing. Player 1 lays down 2 Aces, player 2 lays down 3 twos, player 3 lays down 1 three. Player two, however, believes player 3 had no threes, and calls out "bullshit". Player 3, in fact, had not laid down a three, but a king. Player 3 must pick up the cards laid down thus far. Had player two been wrong, he would have had to pick those cards up. Player four then lays down 2 fours, and the play continues until every player but one is rid of their cards. The first out wins, second is second place, etc.

Nonsense. Shit that isn't real, is unproven, or is made-up.

Ghosts, homeopathy, Dianetics, Young Earth Creationism, god, geocentrism, alternative-medicine, UFOs, MLM scams, Nigerian bank scams, etc. are all types of bullshit.

Bullshit is something which is propagated and profited from because there are so many gullible people in our society.