Snoop Dogg -- Blasts Iggy Azalea on Video ... Yo' N**ga Better Shut You Up, Or I Will

1:15 PM PT -- War is over. Snoop just apologized.

Snoop Dogg chose the nuclear option in his war with Iggy Azalea ... calling her a "c**t" and warning her "n**ga" to put her in check!

Snoop posted the video late Tuesday night ... staring into the camera as he said, "You're f**king with the wrong n**ga! And your n**ga betta check you before I do."

There's more, and the tone of this is definitely not playful anymore.

Snoop may have escalated things because Iggy finally shot back on Tuesday by posting a pic of snoop with the caption ... "When your drug addict aunt gets clean."

Snoop captioned his post ... "Last one until she speak now shut da F** up ubitchu."