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2.
Someone who appears in the morning and you have no recollection how she got there or what the fuck she is doing.
Dude the lagoon creature was back again last night.
Jesus Christ the fucking lagoon creature is here...fuck
by Nig Rig December 12, 2009
 
1.
Noun - 1. A sexual partner who's horrendous physical attributes are masked by heavy drinking until the morning after. Synonymous with bucket of yuck.

2. A creature who lives in a lagoon, i.e. an Ibis.
1. Oh god, I boinked a fuckin lagoon creature from the bar last night, time to get my shit checked.

2. Look at that Ibis... it's in a lagoon.
by Stephen Covell February 28, 2006