Adverb
(comparative more suckily, superlative most suckily)

(informal) In a sucky manner; beyond poorly or badly; terribly.

Short for ultimate bias. Typically used by fangirls and fanboys to describe their favourite celebrity amongst the many that they are fans of.

A variation of the word 'suck' in terms of how bad some thing 'sucked'. It's an escalation and elevation of the word sucked. SUCKILY.