Possibly a blend of gulp + slurp.
gurp (third-person singular simple present gurps, present participle gurping, simple past and past participle gurped)
- (slang, rare) To get drunk.
2004 March 8, “Come Gurp With Me”[1]performed by Z-Man:I crawl outta bed about 8 in the mornin' / Start gurpin' 8:30 today is my birthday / It's August 14th and I'm guzzling Rossi / I got me a 40 ain't nothin' gon' stop me
- “gurp”, in The Right Rhymes, launched 2013.