Found 5 phrases starting with OO:

oof-bird	Any source or supplier of money.	Rate it:
ooga booga	to be boogafyed	Rate it:
OOM	Initialism of out of memory.	Rate it:
ooo	An abbreviation for hugs, usually placed at the end of a letter or in text messaging; often placed alongside xxx.	Rate it:
ooo	An abbreviation for Out of Office, a phrase often used in professional contexts to indicate that someone is unavailable for work.	Rate it:

We need you!

A friends

B calculations

C ends

D lives

#A B C D E F G H I J K L M N O P Q R S T U V W X Y Z