1 [intransitive always + adverb/preposition]
to run or fly somewhere so fast you can hardly be seen
streak across/along/down etc
Two jets streaked across the sky.
2 [transitive usually passive]
to cover something with lines of colour, liquid etc:
The sky was streaked yellow and purple.
His hands and arms were streaked with paint.
to run across a public place with no clothes on as a joke or in order to shock people