The Collaborative International Dictionary of English v.0.48:
Gushingly \Gush"ing*ly\, adv. 1. In a gushing manner; copiously. --Byron. [1913 Webster] 2. Weakly; sentimentally; effusively. [Colloq.] [1913 Webster]WordNet (r) 3.0 (2006):
gushingly adv 1: in a gushing manner; "a gushingly prolific writer"