Flat' can also can mean that a bond is trading with no accrued, either because the settlement date coincides with the coupon payment date or else the issuer is not able to make interest payments. Humped is yet another reference to a yield curve where some anomaly pushes yields at one or more maturity dates out of line with surrounding maturities. Residuals is the principal portion left over after all the interest payments have been stripped away. Maturity is the point in time at which your fixed income investment comes to an end and your principal or face value is returned to you. Management fees are what you pay a mutual fund manager to invest your money.
Volatility is how much the price of a bond changes for a given movement in yield.
Performance is what your investments return. Spread is the difference between the bid side and the offered side of a bond quotation. The shorter the bond and the higher the quality of the bond, the closer or 'tighter' the bid-ask spread. Benchmark issues trade tighter than other bonds. Small corporate bond issues with little float may not even have a two-sided market.