"Gat on someone" is a slang phrase that means to surprise or ambush someone. It is spelled with the phonetic symbols /ɡæt/ for the word "gat," which refers to a gun. The word "on" is spelled using the phonetic symbol /ɑn/ to represent the sound of the long "o" vowel. Together, these two words create a phrase that is commonly used in informal settings. It is important to note that the use of this phrase could potentially be seen as offensive or threatening, so it is best to use caution when using it in conversation.