beschissen
shitty
A colloquial, vulgar expression for very bad, awful, or unpleasant.
Das Wetter ist heute wirklich beschissen.
The weather is really shitty today.

shitty / cheated
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shitty
A colloquial, vulgar expression for very bad, awful, or unpleasant.
Das Wetter ist heute wirklich beschissen.
The weather is really shitty today.

This word is a very colloquial and vulgar expression. Use it only in informal situations among friends, because in formal or public contexts it is considered rude and inappropriate.
Ich hatte einen absolut beschissenen Tag bei der Arbeit.
I had an absolutely shitty day at work.
'Beschissen' is the past participle of the verb 'bescheißen.' This verb literally means 'to soil with feces' or, figuratively, 'to cheat.' This origin explains the strongly negative and vulgar meaning of the adjective.
Er war wütend, weil er sich bei dem Autokauf beschissen fühlte.
He was angry because he felt cheated when buying the car.
The adjective is very often used predicatively, that is, together with verbs like 'sein' (to be), 'sich fühlen' (to feel), or 'aussehen' (to look). It then describes the state of a thing or how a person feels.
Die Verbindung mit dem Internet ist heute wieder total beschissen.
The internet connection is totally shitty again today.
In the meaning 'very bad,' the word is often used to evaluate things or situations. Typical combinations are 'ein beschissener Job' (a shitty job), 'beschissene Laune' (shitty mood), or 'ein beschissener Film' (a shitty film).
Wegen des beschissenen Wetters haben wir den Ausflug abgesagt.
Because of the shitty weather, we canceled the outing.
good
'gut' and 'beschissen' are strong opposites. 'gut' is neutral and positive: something has good quality, someone feels good, or something is fair. 'beschissen' means very bad, very unpleasant, or unfair. It can also describe feeling physically very unwell. The style is important: 'beschissen' is vulgar and only fits very casual conversations. At school, at work, or with strangers, it is better to say 'sehr schlecht' (very bad).

Er findet die Wohnung beschissen, weil es ständig laut ist.
He thinks the apartment is shitty because it is constantly noisy.
Ist euer Training im Sommer gut gelaufen?
Did your training go well in the summer?