Full Nigeria is a term related to Town Of Salem (Game). It is a strategy where the Mafia reveal who the other Mafia are, in Death Note for example, to trick town into thinking that innocent people are being framed by the Mafia. In fact, what's really happening, is that Mafia are framing themselves.
For anyone who is unfortunately named "Andrew". It's for all those Andrews' who steals or makes decisions that don't make any sense. Famously a man from Monticello named, "Nigdrew Reynolds."
Guy 1: Hey man did you seeAndrew On T.V?
Guy 2: Hell ya Nigdrew Reynolds got arrested for $1100!
From the anime Jojo's Bizarre Adventure, it is to run away while thinking of a betterplan. Sometimes referred to as a tactical retreat
Smokey: Do you have any backup plans to kill this thing Jojo?
Joseph Joestar: You bet I do!
Smokey: Huh? Really?
Joseph Joestar: Yeah, I've only got one left.
Smokey: What is it?
Joseph Joestar: It's time to use my legs
Smokey: How so?
Joseph: NIGERUNDAYO, SMOKEY
And dying in yo' bed many years from now, would ya be willing ta trade all da days from dis here day ta dat fo' one chance, just one chance, ta come back here as young men an' tell our enemies dat dey may take our lives but dey will never take our freedom ... YUB NUB!