Be/Get all wet

Context #1

Sara:  This weekend we went to Sea World in San Diego.
Tammy: Did you guys have fun?
Sara: Yeah we did!  But during the Shamu show the whale splashed water all over us and we got all wet. 



Context #2

Tim: Guess what!  Last night I left my car window down and it rained all night!
John: Oh man!  
Tim: Yeah, this morning when I got in my car, the inside was all wet! 

Meaning: "all wet" is an adjective phrase, so it is used with the verbs "be/get" just like other adjectives.  It means to become soaked with water, or to become really wet.