
dreckig
dirty
Covered with dirt, dust, or grime; not clean.
Nach dem Fußballspielen im Regen war seine Kleidung komplett dreckig.
After playing soccer in the rain, his clothes were completely dirty.
dirty
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dirty
Covered with dirt, dust, or grime; not clean.
Nach dem Fußballspielen im Regen war seine Kleidung komplett dreckig.
After playing soccer in the rain, his clothes were completely dirty.

dirty
In a figurative sense, offensive, indecent, or morally questionable. Often refers to jokes, language, or actions.
Er hat das Spiel mit einem dreckigen Foul für sich entschieden.
He won the game with a dirty foul.

awful
Colloquial for feeling very bad physically or emotionally.
Mit dieser Grippe fühle ich mich einfach nur dreckig.
With this flu, I just feel awful.

dirty
Describes a laugh that sounds suggestive, maliciously pleased, or sly.
Als sein Plan aufging, lachte er dreckig.
When his plan worked, he laughed dirtily.
The adjective 'dreckig' (dirty) is derived directly from the noun 'der Dreck' (dirt/grime), which means dirt or filth. It is the quality of being covered with dirt.
Zieh deine Schuhe aus, sie sind voller Dreck.
Take off your shoes; they are full of dirt.
In a figurative sense, 'dreckig' (dirty) describes not only physical dirt, but also morally bad or unfair behavior. Typical combinations are 'dreckige Witze' (dirty jokes), 'dreckige Tricks' (dirty tricks), or 'ein dreckiges Geschäft' (a dirty business/deal).
Er hat mit einem dreckigen Trick gewonnen.
He won with a dirty trick.
The expression 'sich dreckig fühlen' (to feel awful) or 'es geht mir dreckig' (I feel awful) is colloquial and means that someone feels very bad physically or emotionally, e.g., because of illness or sadness.
Nach der Trennung ging es ihm wochenlang richtig dreckig.
After the breakup, he felt really awful for weeks.
The fixed combination 'dreckig lachen' (to laugh dirtily) describes a laugh that does not sound cheerful, but rather maliciously pleased, mean, or suggestive.
Als er sah, dass ich hingefallen war, lachte er dreckig.
When he saw that I had fallen down, he laughed dirtily.
lousy / awful
Mies and dreckig can both colloquially describe feeling physically or emotionally bad. Dreckig usually sounds stronger and is especially common in the expression „jemandem geht es dreckig“ (someone is feeling awful). Mies is more suitable for ordinary discomfort, while dreckig is more suitable for extreme misery.

Nach der Trennung ging es Paul so dreckig, dass er kaum schlafen konnte.
After the breakup, Paul felt so awful that he could barely sleep.
Nach der Trennung fühlte sich Paul einige Tage mies.
After the breakup, Paul felt lousy for several days.