The following word doesn't appear anywhere else on the Internet!
(The curious thing is that all shorter spellings of the word have been taken. At the time of checking, the counts were as follows:)
| que | 456,000,000 |
| queue | 55,900,000 |
| queueue | 225 |
| queueueue | 498 |
| queueueueue | 406 |
| queueueueueue | 282 |
| queueueueueueue | 124 |
| queueueueueueueue | 24 |
| queueueueueueueueue | 12 |
| queueueueueueueueueue | 3 |
| queueueueueueueueueueue | 7 |
| queueueueueueueueueueueue | 11 |
| queueueueueueueueueueueueue | 22 |
| queueueueueueueueueueueueueue | 1 |
| queueueueueueueueueueueueueueue | None |