MEW
From BNSwiki
Holy mew, Batman!
Sound made by pandas everywhere they go, as documented in Comics 24, 113, 115, 116, 118 and 186.
It is, by far, the most used onomatopoeia at 47 instances to date (not including the 5 "spoken" by the panda queen). This includes a total of 21 MEWs in comic 115, which must be some sort of record. The Guiness people have been called.
