down-and-dirt·y (dounənd-dûrtē)
adj. Informal
► Intently and fiercely competitive, often unscrupulously so: “Keeping his cool has never been easy for [him] in the playoffs... when opponents do their down-and-dirty best to bewitch, bother and bewilder him” (Phil Anastasia).
► Bawdy; lewd.

[TahlilGaran] American Dictionary ▲

down-and-dirty
1.
down-and-dirty behaviour is not pleasant or honest.
He ran a down-and-dirty political campaign.

2.
something that is down-and-dirty is shocking, often because it is connected with sex.
He likes his films down-and-dirty.

[TahlilGaran] English Idioms Dictionary ▲

down and dirty
unfair/nasty/sneaky
The team decided to get down and dirty in order to try and win the tournament.

[TahlilGaran] English Idioms Dictionary ▲