Injection(s) from a Lactating Yak. One or more injections that are given to a human being by a mother yak while meanwhile she’s in the process of lactating.
Son: Hey mom? Will I get to have my flu shot at the doctor’s office this time?
Mom: No, pumpkin. Daddy lost his job again and we can’t afford an actual doctor. You’ll have to get an Ily like last time.
It stands for 'I love you you'.
But if someone says ily to you, just note that they have friendzoned you or saying it for the sake of it because I'd they really had to they'd write it in full, instead of saving 7 second of their life.