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2.
A general state of chaos or disarray. Similar to clusterfuck.

Etymology:

The ancient British originally used the word 'fuckslug' in situations where the word 'fuckton' was too hyperbolic and generally just over the top. With a decline in the use of slugs as a mass unit, the seventeenth century saw a reversal of the word into 'slugfuck', and a further evolution of its meaning to the current usage.
Rob: Wait a second - is it ton, tonne, or tun? God, this whole system is a complete slugfuck.

Steve: I know. Fucking brits.

Rebecca: Seriously.
by ploomp December 19, 2011
 
1.
having sex with a pre-op transvestite with a non-working penis
I mean, yah, it's a dude, but slug fucking doesn't make me gay does it?
by scooby_snack4u November 24, 2008
 
3.
Punching a woman in the head while you're fucking her
"When I was banging Lisa, I didn't know what to do with my hands ... so I slugfucked her !" Synonym: 'LoveTaps'
by MrHunghorse June 05, 2007