I think that sentence is a contraction of "Tutuloy na ako" which means "I've gotta go/I'm going in." And "tuloy" is quite synonymous with the English word "continue." Here's a list of some of the conjugations of the word "tuloy" for you to 'catch' the sense. :D tuloy = continue/to go in. ie, "tuloy po kayo!" (please get in!) patuloy = continuing (adj). ie "patuloy parin ang kanyang pagkain" (he's/she's still eating) ipagpatuloy = to continue (v). ie "ipagpatuloy mo nga kung anong sinasabi mo" (please continue whay you're saying)

come in! Tuloy kayo!

:D

Thanks for the great answer.