ayaḿ hi paramo lābho
gṛheṣu gṛha-medhinām
yan narmair īyate yāmaḥ
priyayā bhīru bhāmini
ayam -- this; hi -- indeed; paramah -- the greatest; labhah -- gain; griheshu -- in family life; griha-medhinam -- for worldly householders; yat -- which; narmaih -- with joking words; iyate -- is spent; yamah -- time; priyaya -- with one's beloved; bhiru -- O timid one; bhamini -- O temperamental one.
The word bhamini indicates an angry, passionate, temperamental woman. Since lovely Rukmini did not become angry despite all provocation, the Lord is still speaking facetiously.