俺のロードローラーだッ！ (Ore no Road Roller da!)

Background
The song was first uploaded on January 1st 2008; and is Meiyokaichou-P's first and most notable work. Not only is it Meiyokaichou-P's most notable work, it's also the Kagamines' first early hits (For they're released on December 27th 2007), along with Otomania's Ievan Polkka (Len and Rin's version) uploaded three days after the Kagamines' release, "It's my Roadroller" technically became Len and Rin's second hit, with over 700,000 views to date, followed by Signal-P's "Rin Rin Signal" uploaded a week after (which also became a hit).

Around the fandom, the "road roller" is known to be Len and Rin's character item, along with banana and orange. This is the first (and presumably the most viewed) song to feature the Kagamines with the roadroller. It started with the user "loadorigin" who posted a talkloid regarding Rin's (at the time Len was yet to be revealed) release. It's a talkloid which features Miku, and how she said she "loves" negi (which is her character item). She said if she likes negi, then Rin should have something as well, and Miku responds saying "it should be a road roller.". Based on the "wryyyyyyy" meme of Za Warudo, and wryyyyyy + n "sounds" like Rin (wryyyyyn). The talkloid became very popular with over 1 million views, and so from then on, Rin's character item was more or less "reserved".

There is a difference between "wryyyyy" and "wryyyyyY" (and these comments are posted many times in the song, It's my Roadroller in Nico Nico Douga). "Y" is a symbol for Hatsune Miku, (especially if it's a green Y, for it resembles a negi). "wryyyyyyyy" is a battle cry (more can be read on the meme page of "wryyy") and for that, it can be seen that "wryyyyyY" is a battle cry / road roller sound for Hatsune Miku (in other words, to crush Hatsune Miku).

The song "It's my Roadroller" was somewhat iconic, which had shaped head cannons to several fans, much like "melody" or "KOISURU VOC@LOID", which shaped the head cannons for Hatsune Miku and terms such as "master". It's featured in the Exit Tunes compilation, "Vocaloanthems".

In the song "It's my Roadroller" itself, it talks how Len and Rin thanks "you" who bought them as Vocaloids, and how they were ready to sing. They became somewhat mischievous not that they weren't in the beginning and started a little rampage and left you alone, saying they're "ready to fly on their own".