Top definition
Romantic and/or sexual relationship between Noel Gallagher and Liam Gallagher of Oasis.
It is mentioned in Oasis Slash, some kind of fanfiction.
Gallaghers brothers take the term "brotherly love" to new heights, inventing special meanings of this phrase.

"I wanna Gallaghercest!"
"No. Maybe after my serial."
"But I want it now! Oh, come on!"
"No! I haven't got much time!! So many e-mails and news..."
"Ok... Liam. Shut up and roll over."
by Firefox Sally April 26, 2009
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