Are you talking about Leeroy on Episode 1008 of South Park titled "Make Love, Not Warcraft"?
Because if you are, you're a total geek.
Kimi wa ne tashika ni ano toki watashi no soba ni ita
Itsudatte itsudatte itsudatte
Sugu yoko de waratteita
Nakushitemo torimodosu kimi wo
I will never leave you