You say this to encourage someone who is working hard, such as running in a marathon or studying. Another way of saying this is "GANBATTE."
"Ganbare." = Hang in there.
"Arigatoo." = Thank you.
Note: In the system of romanization used in this section, "ee" is not pronounced like feet. Instead, it means that the vowel sound "e" as in pet is prolonged. In the same manner, "oo" is pronounced not like shoot but as the "o" vowel, similar to pork, pronounced twice as long.