Matt's ass, a great, unending cavern in which many things reside. Also acts as a dimensional portal connected to China through means unknown to mortal man.
A variation of the Dutch oven. It is the act of letting a silent fart when in bed with your wife or girlfriend, then slowly lifting your leg beneath the sheets (forming the "tunnel"), and then let your leg down, allowing the weight of the covers to gently waft the stench of your fart into the face of your significant other.
it's not about the "other" tunnel of love, i.e. vagina
And the big wheel keep on turning
Neon burning up above
And I'm just high on this world
Come on and take a low ride with me girl
On the tunnel of love Yeah love, love, love
On the tunnel of love Woah love, love
Guy: Thanks for going on the Chocolate Tunnel of Love with me again.
Girl: I was scared the first time I tried it, but after that, I was surprised how much I liked it!