Lyric discussion by CandyFlip 

Cover art for Nevermind lyrics by Birthday Massacre, The

I think this song's about something that happened when it wasn't supposed to-- an 'accident'-- and how people decide to ignore it to avoid "awkwardness."

Going into a little more detail, my interpretation is the speaker's run into a person who she once met at a Christmas party, and is bringing herself up to date on what she remembers about him for the first two verses. In the third she is addressing him, tactfully reminding him of the party they met at while not mentioning what actually took place between them. In the final verse she observes how he's changed, then grows cold towards him.

And going into further detail, I'll explain how I came to that conclusion:

Line 1: After drinking five glasses of liquor, she becomes more agreeable. Line 2: Suggesting she said she would leave at a certain time or in a certain amount of time, and while that time has passed she is still there. Line 3: Suggesting the speaker is a bit of a "stay-at-home," not someone who goes out to party a lot. Line 4: Suggesting that she doesn't know how to act in this 'environment,' and needs guidance.

Line 5: The speaker and whoever she's addressing have gone somewhere more 'private' or 'smaller.' She/they are careless, lust-ridden and intoxicated. Line 6: Again just stressing that they're away from everyone else, in privacy. Line 7: The exact wording is a bit difficult, but I believe that what's being expressed is that she (in retrospect) is observing the invitation she gave him (to go back to her house, or metaphorically the invitation to have sex with her) was sort of an involuntary one, as either : 1) it was only due to her intoxicated state; it was never clearly thought through or 2) it was just extrapolated from what had happened already (talking, making out, whatever) and never actually made-- "involuntary dilation"; an involuntary 'expansion' (extrapolation); basically an assumption. So the whole line could mean something like "The invitation was just something you assumed. I can't even remember your name."

Lines 8-11: Now she's addressing the person directly, reminding him of the circumstances under which they met-- a Christmas party.

Line 12: She observes he's become a more "caught up in the game"-type person. Line 13: While observing further change in him, her tactful form of address slips up and she goes to bring up the 'awkward' memory, which they are both pretending to have forgotten. Lines 14-15: Possibly out of embarassment after her slip-up, she states that what happened held no pleasantness and that there is no pleasantness between them.

Your interpretation is so well done. five dozen cookies. Loving it.